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26 tháng 11 2021

. Nội qui tham gia "Giúp tôi giải toán"

1. Không đưa câu hỏi linh tinh lên diễn đàn, chỉ đưa các bài mà mình không giải được hoặc các câu hỏi hay lên diễn đàn;

2. Không trả lời linh tinh, không phù hợp với nội dung câu hỏi trên diễn đàn.

3. Không "Đúng" vào các câu trả lời linh tinh nhằm gian lận điểm hỏi đáp.

Các bạn vi phạm 3 điều trên sẽ bị giáo viên của Online Math trừ hết điểm hỏi đáp, có thể bị khóa tài khoản hoặc bị cấm vĩnh viễn không đăng nhập vào trang web.

20 tháng 12 2019

a)n.(n+1)/2

đáp án là 3 bn

 hok tốt

7 tháng 5 2017

Tìm lỗi sai ở mỗi câu dưới đây và sửa lỗi

1) Chris said that the twins couldn’t goto school this => THAT day because they were ill

A B C D

2) Smoking is generally recognize => RECOGNIZED as one of the major cause of heart disease

A B C D

3) She took the list of visitors'snames and arranges

=> ARRANGED them into groups of four

A B C D

4) He asked the tourist information officer suggesting => SUGGESTED where he could go

A B C D

5) She threw the bag of potato chips to James and he catches => CATCHED it with one hand

A B C D

Dear Van,

Today, in Vietnam often encountered many natural disasters such as floods, droughts, hail, tropical storms and other natural disasters. These are the most frightening things people are concerned about. Tropical storms often occur and cause most harm. It usually occurs in the rainy season and occurs most often in central Vietnam and coastal areas. It causes a lot of damage to people and property. First, killing people, livestock and poultry by the flood. Second, crop loss due to flooding. Humans become homeless and lose all their possessions. and many other damages caused by the storm. To prevent and fight against tropical storms, before it takes place, we must make preventive dikes, prepare adequate tools and food and other necessities. When storms occur, people must find safe shelters not to go out. After that, we have to overcome what hurricanes destroy, such as rebuilding houses, and many other things, if we live in that area, we should plant trees, protect the environment and many other practical things.

I am glad if you tell me about it in the next letter.

I look forward to your reply.

Your Best friend,

Ha Nhien.

#Tham khảo

2 tháng 10 2019

Tính từ dài : My school bag is more beautiful than your school bag.

tính từ dài : The skirt is cheaper than the jeans

Trạng từ ngắn: The rabbit runs faster than the turtle.

Trạng từ dài : We can travel more safely in the countryside than in the city

1.Mai cut __________(1 Điểm)herselfhimselfyouselfmyself2.We ought _______ the wardrobe in the corner opposite the bed.(1 Điểm)putpushto putto push3.It's dangerous to let children _________ in the kitchen.(1 Điểm)playto playto playingplaying4.We've got a problem. I hope you can help________(1 Điểm)myselfyourselfusthem5.The calendar is _______the clock, _________ the picture and the lamp.(1 Điểm)on/next tounder/betweenbehind/betweenabove/on6.Deaf-mute can _______ speak...
Đọc tiếp

1.Mai cut __________

(1 Điểm)

herself

himself

youself

myself

2.We ought _______ the wardrobe in the corner opposite the bed.

(1 Điểm)

put

push

to put

to push

3.It's dangerous to let children _________ in the kitchen.

(1 Điểm)

play

to play

to playing

playing

4.We've got a problem. I hope you can help________

(1 Điểm)

myself

yourself

us

them

5.The calendar is _______the clock, _________ the picture and the lamp.

(1 Điểm)

on/next to

under/between

behind/between

above/on

6.Deaf-mute can _______ speak ________hear

(1 Điểm)

both ......... and 

not only ........ but also

neither ........... nor

either ........... or

7.Would you like ___________ a message ?

(1 Điểm)

to leave

leave

leaving

left

8.Don't come in. Please wait __________for your turrn.

(1 Điểm)

inside

downstairs

outside

upstairs

9.You can use a _________ to record messages when you are out.

(1 Điểm)

telephone directory

mobile phone

fax machine

answering machine

10.A.G.Bell was born _________ March 3, 1847

Trình đọc Chân thực

(1 Điểm)

in

on

at

during

1
18 tháng 10 2021

1.Mai cut __________

(1 Điểm)

herself

himself

youself

myself

2.We ought _______ the wardrobe in the corner opposite the bed.

(1 Điểm)

put

push

to put

to push

3.It's dangerous to let children _________ in the kitchen.

(1 Điểm)

play

to play

to playing

playing

4.We've got a problem. I hope you can help________

(1 Điểm)

myself

yourself

us

them

5.The calendar is _______the clock, _________ the picture and the lamp.

(1 Điểm)

on/next to

under/between

behind/between

above/on

6.Deaf-mute can _______ speak ________hear

(1 Điểm)

both ......... and 

not only ........ but also

neither ........... nor

either ........... or

7.Would you like ___________ a message ?

(1 Điểm)

to leave

leave

leaving

left

8.Don't come in. Please wait __________for your turrn.

(1 Điểm)

inside

downstairs

outside

upstairs

9.You can use a _________ to record messages when you are out.

(1 Điểm)

telephone directory

mobile phone

fax machine

answering machine

10.A.G.Bell was born _________ March 3, 1847

(1 Điểm)

in

on

at

during

18 tháng 10 2021

xóa bài giúp mik nhaa

 

9 tháng 2 2022

1. If you don't leave home early, you will miss the flight.

2. If you be outside in the rain, you will get wet.

3. If you don't walk faster, you will miss the bus.

4. If you don't pay, they will cut off the electricity.

5.  If you touch that wire, you will get an electric shock.