Each face of a cube is painted with exactly one colour . What is the smallest number of colours needed to paint a cube so that no two faces that share an edge are the same colour ?Các bạn giải chi tiế...

TB

Trần Bảo Ngọc

1 tháng 1 2018

Tên gì dài thía!? =~=

HA

»» Hüỳñh Äñh Phươñg ( ɻɛɑm ʙáo cáo....

4 tháng 10 2020

Câu hỏi hay

There are 4n pebbles of weights 1, 2, 3, . . . , 4n. Each pebble is coloured in one of n colours and there are four pebbles of each colour. Show that we can arrange the pebbles into two piles so that the following two conditions are both satisfied:

• The total weights of both piles are the same.

• Each pile contains two pebbles of each colour.

#Toán lớp 5

1

N

nguyenthuyhue

16 tháng 10 2020

nghĩa là :

Có 4n viên sỏi có trọng lượng 1, 2, 3 ,. . . , 4n. Mỗi viên sỏi được tô một trong n màu và có bốn viên sỏi mỗi màu. Chứng tỏ rằng chúng ta có thể sắp xếp các viên sỏi thành hai đống sao cho thỏa mãn hai điều kiện sau:

• Tổng trọng lượng của cả hai cọc là như nhau.

• Mỗi đống chứa hai viên sỏi mỗi màu.

LV

Lê Văn Quân

13 tháng 10 2017

A big cube is made up of 27 small cubes . All the faces of big cube are then painted. How many of the small cubes have exactly three painted faces

HELP ME TÔI SẼ CHO ACC LIÊN QUÂN BẬC VÀNG

#Toán lớp 6

3

SK

Sakura Kinomoto

13 tháng 10 2017

theo mk tính thì là 12 hình đó bn

LV

Lê Văn Quân

13 tháng 10 2017

mình thi AMO đó

A cube is cut in three directions as shown, to produce eight cuboids (each cut is parallel to one of the faces of the cube). What is the ratio of the total surface area of the eight cuboids to the surface area of the original cube? Helpppppppppppppppppppppppppppppppppppppp

E

Elsa

31 tháng 1 2021

#Tiếng anh lớp 7

1

LM

Lê Minh Vũ

CTVHS VIP

1 tháng 2 2021

Given, A solid cube is cut at middle to make two make two cuboids.

Let the side of the cube be a and it is cut at middle. So breadth of newly formed cuboids is (a/2), length isa, height is a.
Total surface area of cube=6a2
Total surface area of cuboids = Surface area of cuboid
=2(lb+bh+lh)=2(2a×a+a×a+2a×a)=4a2

Ratio of total surface area of cube to cuboid =4a26a2=3:2

Read the following passage and mark the letter A, B, C or D on your answer sheet to indicate the correct answer to each of the questions.Early humans saw a variety of natural colours around them, from the browns and greens of the soil and plants to the deep blues and red of the sky. They painted their bodies with colours from nature to signal aggression toward an enemy, or to make themselves attractive to a mate.A girl and a rainbow of crushed ice flavors at Chowpatty Beach, India. Over the...

LQ

Lê Quỳnh Anh

13 tháng 12 2019

Read the following passage and mark the letter A, B, C or D on your answer sheet to indicate the correct answer to each of the questions.

Early humans saw a variety of natural colours around them, from the browns and greens of the soil and plants to the deep blues and red of the sky. They painted their bodies with colours from nature to signal aggression toward an enemy, or to make themselves attractive to a mate.

A girl and a rainbow of crushed ice flavors at Chowpatty Beach, India. Over the centuries, the sources of colours such as blue, purple, and red were high valued and they were often worth as much as gold. In the 19^th century, a young chemistry student manufactured the first synthetic dye, and suddenly the world became a much more colorful place. In the 20^th century, scientists discovered the psychological effects of colours, and people found ways to use this discovery to influence our feelings and behaviors.

RED

Red, colour of blood, symbolises fire, love and anger. In Eastern cultures, people believe it brings luck, wealth and success. In humans, the color red can send different messages. Some people redden, for example, when they are angry or embarrassed. Researchers have discovered that in sports the team that is wearing red is more likely to win. Why? Because red seems to be the color that signals dominance, giving those dressed in red an advantage in sporting events. In many animal species (including humans), contact with this bold color causes the heart rate to increase. However, one of red’s lighter shades, pink, can have the opposite effect on people. Man in prisons are less agressive when the walls are a specific shade of pink.

YELLOW

Yellow, the colour that comes to mind when we think of sunshine, is found throughout nature and the man-made world as a colour that commands attention; indeed, it is one of the easiest colours to see. This highly visible shade is found on everything from school buses to traffic signs and pens that we use to highlight important information in a text. The colour is also used to caution people; football players, for example, are shown a yellow card as a reminder to behave. It can be used as a stimulant as well: in a number of studies, yellow has been found to help children focus on their work and do better at school.

BLUE

Blue, the colour of the sky and sea, is associated in many cultures with water, religious objects, and protection against evil. Its darker shades represent calm, stability and power. Dark blue, for example, is the colour of the business suit or police uniform; it tells others, ‘I am in control,’ or ‘I am trustworthy.’ Blue is also associated with sadness. It’s common in English, for example, when you are feeling sad or depressed, to talk about ‘feeling blue,’ while in Iran, blue is the colour of mourning, worn when a person dies. Like pink, blue has a calming effect on people. Rooms painted blue help people to relax or sleep. Sleeping pills are often coloured blue to suggest exactly this idea. This colour also seems to reduce feelings of hunger. Blue food is rarely seen in nature, and when it is, such food is usually no longer healthy to consume. It’s just one more example of the power that colour can hold over us.

What are English speakers refering to when they talk about “feeling blue”?

A. being in control

B. being upset when someone dies

C. being calm

D. being sad

1

DH

Dương Hoàn Anh

13 tháng 12 2019

Đáp án D

Kiến thức: Đọc hiểu

Giải thích:

Người Anh đề cập gì khi nói đến "cảm thấy xanh"?

A. kiểm soát

B. buồn bã khi ai đó chết

C. bình tĩnh

D. buồn

“feeling blue” = sad: buồn bã

Read the following passage and mark the letter A, B, C or D on your answer sheet to indicate the correct answer to each of the questions.Early humans saw a variety of natural colours around them, from the browns and greens of the soil and plants to the deep blues and red of the sky. They painted their bodies with colours from nature to signal aggression toward an enemy, or to make themselves attractive to a mate.A girl and a rainbow of crushed ice flavors at Chowpatty Beach, India. Over the...

LQ

Lê Quỳnh Anh

21 tháng 6 2017

Read the following passage and mark the letter A, B, C or D on your answer sheet to indicate the correct answer to each of the questions.

Early humans saw a variety of natural colours around them, from the browns and greens of the soil and plants to the deep blues and red of the sky. They painted their bodies with colours from nature to signal aggression toward an enemy, or to make themselves attractive to a mate.

A girl and a rainbow of crushed ice flavors at Chowpatty Beach, India. Over the centuries, the sources of colours such as blue, purple, and red were high valued and they were often worth as much as gold. In the 19^th century, a young chemistry student manufactured the first synthetic dye, and suddenly the world became a much more colorful place. In the 20^th century, scientists discovered the psychological effects of colours, and people found ways to use this discovery to influence our feelings and behaviors.

RED

Red, colour of blood, symbolises fire, love and anger. In Eastern cultures, people believe it brings luck, wealth and success. In humans, the color red can send different messages. Some people redden, for example, when they are angry or embarrassed. Researchers have discovered that in sports the team that is wearing red is more likely to win. Why? Because red seems to be the color that signals dominance, giving those dressed in red an advantage in sporting events. In many animal species (including humans), contact with this bold color causes the heart rate to increase. However, one of red’s lighter shades, pink, can have the opposite effect on people. Man in prisons are less agressive when the walls are a specific shade of pink.

YELLOW

Yellow, the colour that comes to mind when we think of sunshine, is found throughout nature and the man-made world as a colour that commands attention; indeed, it is one of the easiest colours to see. This highly visible shade is found on everything from school buses to traffic signs and pens that we use to highlight important information in a text. The colour is also used to caution people; football players, for example, are shown a yellow card as a reminder to behave. It can be used as a stimulant as well: in a number of studies, yellow has been found to help children focus on their work and do better at school.

BLUE

Blue, the colour of the sky and sea, is associated in many cultures with water, religious objects, and protection against evil. Its darker shades represent calm, stability and power. Dark blue, for example, is the colour of the business suit or police uniform; it tells others, ‘I am in control,’ or ‘I am trustworthy.’ Blue is also associated with sadness. It’s common in English, for example, when you are feeling sad or depressed, to talk about ‘feeling blue,’ while in Iran, blue is the colour of mourning, worn when a person dies. Like pink, blue has a calming effect on people. Rooms painted blue help people to relax or sleep. Sleeping pills are often coloured blue to suggest exactly this idea. This colour also seems to reduce feelings of hunger. Blue food is rarely seen in nature, and when it is, such food is usually no longer healthy to consume. It’s just one more example of the power that colour can hold over us.

What is this text mainly about?

A. How views of colour have changed

B. The sources of colour

C. How colour influences people

D. How colour has a calming effect

1

DH

Dương Hoàn Anh

21 tháng 6 2017

Đáp án A

Kiến thức: Đọc hiểu

Giải thích:

Văn bản này chủ yếu là về điều gì?

A. Quan điểm về màu sắc đã thay đổi như thế nào

B. Các nguồn màu sắc

C. Màu sắc ảnh hưởng thế nào đến người

D. Màu sắc có tác dụng làm dịu

Read the following passage and mark the letter A, B, C or D on your answer sheet to indicate the correct answer to each of the questions.Early humans saw a variety of natural colours around them, from the browns and greens of the soil and plants to the deep blues and red of the sky. They painted their bodies with colours from nature to signal aggression toward an enemy, or to make themselves attractive to a mate.A girl and a rainbow of crushed ice flavors at Chowpatty Beach, India. Over the...

LQ

Lê Quỳnh Anh

21 tháng 6 2018

Read the following passage and mark the letter A, B, C or D on your answer sheet to indicate the correct answer to each of the questions.

Early humans saw a variety of natural colours around them, from the browns and greens of the soil and plants to the deep blues and red of the sky. They painted their bodies with colours from nature to signal aggression toward an enemy, or to make themselves attractive to a mate.

A girl and a rainbow of crushed ice flavors at Chowpatty Beach, India. Over the centuries, the sources of colours such as blue, purple, and red were high valued and they were often worth as much as gold. In the 19^th century, a young chemistry student manufactured the first synthetic dye, and suddenly the world became a much more colorful place. In the 20^th century, scientists discovered the psychological effects of colours, and people found ways to use this discovery to influence our feelings and behaviors.

RED

Red, colour of blood, symbolises fire, love and anger. In Eastern cultures, people believe it brings luck, wealth and success. In humans, the color red can send different messages. Some people redden, for example, when they are angry or embarrassed. Researchers have discovered that in sports the team that is wearing red is more likely to win. Why? Because red seems to be the color that signals dominance, giving those dressed in red an advantage in sporting events. In many animal species (including humans), contact with this bold color causes the heart rate to increase. However, one of red’s lighter shades, pink, can have the opposite effect on people. Man in prisons are less agressive when the walls are a specific shade of pink.

YELLOW

Yellow, the colour that comes to mind when we think of sunshine, is found throughout nature and the man-made world as a colour that commands attention; indeed, it is one of the easiest colours to see. This highly visible shade is found on everything from school buses to traffic signs and pens that we use to highlight important information in a text. The colour is also used to caution people; football players, for example, are shown a yellow card as a reminder to behave. It can be used as a stimulant as well: in a number of studies, yellow has been found to help children focus on their work and do better at school.

BLUE

Blue, the colour of the sky and sea, is associated in many cultures with water, religious objects, and protection against evil. Its darker shades represent calm, stability and power. Dark blue, for example, is the colour of the business suit or police uniform; it tells others, ‘I am in control,’ or ‘I am trustworthy.’ Blue is also associated with sadness. It’s common in English, for example, when you are feeling sad or depressed, to talk about ‘feeling blue,’ while in Iran, blue is the colour of mourning, worn when a person dies. Like pink, blue has a calming effect on people. Rooms painted blue help people to relax or sleep. Sleeping pills are often coloured blue to suggest exactly this idea. This colour also seems to reduce feelings of hunger. Blue food is rarely seen in nature, and when it is, such food is usually no longer healthy to consume. It’s just one more example of the power that colour can hold over us.

According to the pasage, the colour red______.

A. is believed to embarrass people

B. gives an advantage to team members who wear it.

C. symbolises bad luck

D. makes people less aggressive.

1

DH

Dương Hoàn Anh

21 tháng 6 2018

Đáp án B

Kiến thức: Đọc hiểu

Giải thích:

Theo đoạn văn, màu đỏ

A. được tin rằng làm cho người ta xấu hổ

B. mang lại lợi thế cho các thành viên trong nhóm mặc nó

C. tượng trưng cho sự không may mắn

D. làm cho người ta ít hăng hái

Thông tin: Researchers have discovered that in sports the team that is wearing red is more likely to win. Why? Because red seems to be the color that signals dominance, giving those dressed in red an advantage in sporting events.

Read the following passage and mark the letter A, B, C or D on your answer sheet to indicate the correct answer to each of the questions.Early humans saw a variety of natural colours around them, from the browns and greens of the soil and plants to the deep blues and red of the sky. They painted their bodies with colours from nature to signal aggression toward an enemy, or to make themselves attractive to a mate.A girl and a rainbow of crushed ice flavors at Chowpatty Beach, India. Over the...

LQ

Lê Quỳnh Anh

16 tháng 1 2017

Read the following passage and mark the letter A, B, C or D on your answer sheet to indicate the correct answer to each of the questions.

Early humans saw a variety of natural colours around them, from the browns and greens of the soil and plants to the deep blues and red of the sky. They painted their bodies with colours from nature to signal aggression toward an enemy, or to make themselves attractive to a mate.

A girl and a rainbow of crushed ice flavors at Chowpatty Beach, India. Over the centuries, the sources of colours such as blue, purple, and red were high valued and they were often worth as much as gold. In the 19^th century, a young chemistry student manufactured the first synthetic dye, and suddenly the world became a much more colorful place. In the 20^th century, scientists discovered the psychological effects of colours, and people found ways to use this discovery to influence our feelings and behaviors.

RED

Red, colour of blood, symbolises fire, love and anger. In Eastern cultures, people believe it brings luck, wealth and success. In humans, the color red can send different messages. Some people redden, for example, when they are angry or embarrassed. Researchers have discovered that in sports the team that is wearing red is more likely to win. Why? Because red seems to be the color that signals dominance, giving those dressed in red an advantage in sporting events. In many animal species (including humans), contact with this bold color causes the heart rate to increase. However, one of red’s lighter shades, pink, can have the opposite effect on people. Man in prisons are less agressive when the walls are a specific shade of pink.

YELLOW

Yellow, the colour that comes to mind when we think of sunshine, is found throughout nature and the man-made world as a colour that commands attention; indeed, it is one of the easiest colours to see. This highly visible shade is found on everything from school buses to traffic signs and pens that we use to highlight important information in a text. The colour is also used to caution people; football players, for example, are shown a yellow card as a reminder to behave. It can be used as a stimulant as well: in a number of studies, yellow has been found to help children focus on their work and do better at school.

BLUE

Blue, the colour of the sky and sea, is associated in many cultures with water, religious objects, and protection against evil. Its darker shades represent calm, stability and power. Dark blue, for example, is the colour of the business suit or police uniform; it tells others, ‘I am in control,’ or ‘I am trustworthy.’ Blue is also associated with sadness. It’s common in English, for example, when you are feeling sad or depressed, to talk about ‘feeling blue,’ while in Iran, blue is the colour of mourning, worn when a person dies. Like pink, blue has a calming effect on people. Rooms painted blue help people to relax or sleep. Sleeping pills are often coloured blue to suggest exactly this idea. This colour also seems to reduce feelings of hunger. Blue food is rarely seen in nature, and when it is, such food is usually no longer healthy to consume. It’s just one more example of the power that colour can hold over us.

Yellow is used to highlight information in a text because

A. it is an important colour.

B. it can be used to caution people.

C. it is a highly visible colour.

D. people prefer this colour to other colours.

1

DH

Dương Hoàn Anh

16 tháng 1 2017

Đáp án B

Kiến thức: Đọc hiểu

Giải thích:

Màu vàng được sử dụng để làm nổi bật thông tin trong một văn bản vì

A. nó là một màu sắc quan trọng.

C. nó là một màu dễ nhận thấy.

B. nó có thể được dùng để cảnh báo mọi người.

D. người ta thích màu này hơn màu khác.

Thông tin: This highly visible shade is found on everything from school buses to traffic signs and pens that we use to highlight important information in a text. The colour is also used to caution people

Read the following passage and mark the letter A, B, C or D on your answer sheet to indicate the correct answer to each of the questions.Early humans saw a variety of natural colours around them, from the browns and greens of the soil and plants to the deep blues and red of the sky. They painted their bodies with colours from nature to signal aggression toward an enemy, or to make themselves attractive to a mate.A girl and a rainbow of crushed ice flavors at Chowpatty Beach, India. Over the...

LQ

Lê Quỳnh Anh

10 tháng 10 2018

Read the following passage and mark the letter A, B, C or D on your answer sheet to indicate the correct answer to each of the questions.

Early humans saw a variety of natural colours around them, from the browns and greens of the soil and plants to the deep blues and red of the sky. They painted their bodies with colours from nature to signal aggression toward an enemy, or to make themselves attractive to a mate.

A girl and a rainbow of crushed ice flavors at Chowpatty Beach, India. Over the centuries, the sources of colours such as blue, purple, and red were high valued and they were often worth as much as gold. In the 19^th century, a young chemistry student manufactured the first synthetic dye, and suddenly the world became a much more colorful place. In the 20^th century, scientists discovered the psychological effects of colours, and people found ways to use this discovery to influence our feelings and behaviors.

RED

Red, colour of blood, symbolises fire, love and anger. In Eastern cultures, people believe it brings luck, wealth and success. In humans, the color red can send different messages. Some people redden, for example, when they are angry or embarrassed. Researchers have discovered that in sports the team that is wearing red is more likely to win. Why? Because red seems to be the color that signals dominance, giving those dressed in red an advantage in sporting events. In many animal species (including humans), contact with this bold color causes the heart rate to increase. However, one of red’s lighter shades, pink, can have the opposite effect on people. Man in prisons are less agressive when the walls are a specific shade of pink.

YELLOW

Yellow, the colour that comes to mind when we think of sunshine, is found throughout nature and the man-made world as a colour that commands attention; indeed, it is one of the easiest colours to see. This highly visible shade is found on everything from school buses to traffic signs and pens that we use to highlight important information in a text. The colour is also used to caution people; football players, for example, are shown a yellow card as a reminder to behave. It can be used as a stimulant as well: in a number of studies, yellow has been found to help children focus on their work and do better at school.

BLUE

Blue, the colour of the sky and sea, is associated in many cultures with water, religious objects, and protection against evil. Its darker shades represent calm, stability and power. Dark blue, for example, is the colour of the business suit or police uniform; it tells others, ‘I am in control,’ or ‘I am trustworthy.’ Blue is also associated with sadness. It’s common in English, for example, when you are feeling sad or depressed, to talk about ‘feeling blue,’ while in Iran, blue is the colour of mourning, worn when a person dies. Like pink, blue has a calming effect on people. Rooms painted blue help people to relax or sleep. Sleeping pills are often coloured blue to suggest exactly this idea. This colour also seems to reduce feelings of hunger. Blue food is rarely seen in nature, and when it is, such food is usually no longer healthy to consume. It’s just one more example of the power that colour can hold over us.

The word “they” refers to

A. early humans

B. colours

C. plants

D. deep blues

1

DH

Dương Hoàn Anh

10 tháng 10 2018

Đáp án A

Kiến thức: Đọc hiểu

Giải thích:

Từ "they" dùng để chỉ

A. người tiền sử B. màu sắc

C. thực vật D. xanh đậm

“they” dùng để chỉ “early humans”

Early humans saw a variety of natural colours around them, from the browns and greens of the soil and plants to the deep blues and red of the sky. They painted their bodies with colours from nature to signal aggression toward an enemy, or to make themselves attractive to a mate.

Người tiền sử nhìn thấy nhiều màu sắc tự nhiên xung quanh họ, từ màu nâu, màu xanh lá cây của đất và của cây cối đến màu xanh thẫm và màu đỏ của bầu trời. Họ vẽ thân thể của mình với màu sắc từ tự nhiên để đánh dấu sự xâm lược đối với kẻ thù, hoặc để làm cho mình hấp dẫn với một người bạn đời.