đây nhanh lên ạ em ko có thời gian
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NT
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Những câu hỏi liên quan
18 tháng 2 2022
câu 1 mk ko biết nhé
xe 2 vận tốc 40 km /h
Thời gian xe đi 1km nửa quãng đường đầu là:
1 : 60 = 1/60 (giờ)
Thời gian xe đi 1km nửa quãng đường sau là:
1 : 40 = 1/40 (giờ)
Thời gian xe đi 2 km (1km nửa đường đầu và 1km nửa đường cuối) là:
1/60 + 1/40 = 1/24 (giờ)
Vận tốc trung bình trên cả quãng đường là:
2 : 1/24 = 48 (km/h)
Đáp số: 48 km/h.
xe3 vận tốc 35 km /h
Thời gian lúc đi là:
14 : 35 = 0,4 (giờ)
Thời gian cả đi lẫn về là:
(14 × 2) : 28 ≈ 0,9 (giờ)
Thời gian lúc về là:
0,9 − 0,4 = 0,5 (giờ)
Vận tốc lúc về là:
14 : 0,5 = 28 (km/h)
Đ/s: 28 km/h
19 tháng 2 2022
Vận tốc trung bình mỗi xe về đích là:
(45 + 40 + 35) : 3 = 40 (km/h)(45 + 40 + 35) : 3 = 40 (km/h)
Đáp số: 40 km/h
8 tháng 3 2022
Đổi 20 phút = 1/3 giờ
Gọi : V1=45km/h, V2=60km/h
Thời gian xe 1 đi hết quãng đường AB là t1, của xe 2 là t2
Ta có:
t1.V1=AB => t1=AB/V1=AB/45
t2.V2=AB => t2=AB/V2=AB/60
=> AB/45-AB/60=1/3
<=> 4AB/180-3AB/180 =1/3
<=> AB/180 =1/3
=> AB=60 ( km ).
19 tháng 2 2022
Vận tốc trung bình mỗi xe về đích là:
(45 + 40 + 35) : 3 = 40 (km/h)(45 + 40 + 35) : 3 = 40 (km/h)
Đáp số: 40 km/h
16 tháng 2 2019
Nhóm 1: chữ số 4 ở đầu: 1 số
Nhóm 2:chữ số 3 ở đầu : 3 số
Nhóm 3: chữ số 2 ở đầu : 6 số
Nhóm 4: chữ số 1 ở đầu : 10 số
Vậy có 20 số bạn nhé
LC
16 tháng 2 2019
Bạn muốn nhận giày và balo miễn phí cho năm học mới? --->Tham gia ngay Minigame NHANH NHƯ CHỚP số thứ 7 ngày 16/02/2019 tại đây: https://alfazi.edu.vn/question/5c6818c4641b064a18a2575b Cơ hội rất hiếm! Hôm qua bạn Thiên An vừa nhận được 1 balo trị giá 350k đấy! Xem chi tiết :https://alfazi.edu.vn/question/5c6818c4641b064a18a2575b
ALFAZI THƯƠNG HIỆU HỌC TẬP SỐ 1 VN!
DH
3
NH
17
B
2 tháng 2 2023
1) The student is from Vietnam. She sits next to me.
->The student who sits next to me is from Vietnam
2) I thanked the woman. This woman had helped me.
->I thanked the woman who had helped me
3) The professor is excellent. I’m taking his course.
->The professor whose course I'm taking is excellent
4) The man is my father. I respect his opinions most.
->The man whose opinions I respect most is my father
5) She is the most intelligent woman. I have never met this woman.
->She is the most intelligent woman that I have ever met
6) Do you know the music ? It is being played on the radio.
->Do you know the music which is being played on the radio
7) I recently went back to Paris. It is still as beautiful as a pearl
->I recently went back to Paris which is still as beautiful as a pearl
8) That man is an artist. I don’t remember the man’s name.
->That man is an artist whose name I don't remember
9) That car belongs to Dr. Clark. Its engine is very good.
->That car whose engine is very good belongs to Dr. Clark
10) This is Mrs. Jones. Her son won the championship.
->This is Mrs. Jones whose son won the championship
11) There is a No Parking sign. I don’t take notice of it.
->There is a No Parking sign of which I don't take notice
12) His letter is full of interesting news. I received it two days ago.
->His letter which I received two days ago is full of interesting new
13) The book is about Africa. It has some wonderful pictures.
->The book which has some beautiful pictures is about Africa
14) My mother still goes in for sports. She is over 45.
->My mother who is over 45 still goes in for sports
15) The tables are old. They are in the living room.
->The tables which are in the living room are old
16) The book was torn. I gave it to him.
->The book which I gave to him was torn
17) Last month my father bought me a book. It was very expensive.
->Last month my father bought me a book which was very expensive
18) The knife was dull. She used it to cut bread.
->The knife which she used to cut bread was dull
19) Do you see these cars? They have just passed by.
=>Do you see these cars which have just passed by?
20) Have you ever ridden the horse? She bought it in Tu Xuyen.
->Have you ever ridden the horse which she bought in Tu Xuyen?
21) The computer was bought last month. It belonged to my sister.
->The computer which was bought last month belonged to my sister
22) The house was in bad condition. They built it three centuries ago.
The house which was built three centuries ago was in bad condition
23) The man gave me some screwdrivers(cái tua vít). They were not in good condition.
->The man gave me some screwdrivers that were not in good condition
24) They showed me the photos. They took them during the trip in Japan.
-> They showed me the photos which were taken by them during the trip in Japan
25) Do you know the man? He is talking to the principal.
->Do you know the man who is talking to the principal?
26) The man is standing in front of the house. He is complaining about the waste.
->The man who is standing in front of my house is complaining about the waste
27) All the people have disliked him. I have never met them.
->All the people whom I have never met have disliked him
28) The book is new. I have just bought it.
->The book which I have just bought is new
29) Anybody may leave. They are tired.
->Anybody who are tired may leave
30) The dictionary was given by my sister. She has just returned from England.
->The dictionary was given by my sister who has just returned from England
31) That is everything. She needs them for her camping trip.
->That is everything that she needs for her camping trip
32) There’s the man. His wallet was stolen.
->There's the man whose wallet was stolen
33) There are a few things. We can do them.
->There are a few things that we can do
34) I met the woman. Her husband is the president of the corporation.
-> I met the woman whose husband is the president of the corporation
35) I come from a country. Its history goes back thousands of years.
I come from a country whose history goes back thousands of years
36) This is the pupil. You might want to make friends with him.
->The is the pupil with whom you might want to make friends
37) The professor is excellent. I am taking her course.
->The professor whose course I am taking is excellent
38) Mark Twain is an author. You like his books best.
->Mark Twain is an author whose books you like best
TG
5
L
9 tháng 3 2022
Cánh quạt khi quay thì cọ xát mạnh với không khí nên bị nhiễm điện, vì thế nó hút những hạt bụi trong không khí ở gần nó. Đặc biệt, mép cánh quạt cọ xát nhiều với không khí nên hút nhiều bụi hơn. Vì thế sau 1 thời gian ta lại thấy có nhiều bụi bám vào cánh quạt
Trả lời :
B. 2,09
#Y/n
TL:
\(2\frac{9}{100}=2,09\)
Là đáp án B
chúc bn học tốt