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23 tháng 7 2021

Tổng vận tốc hai xe là

180 : 2 = 90 (km/h)

Vận tốc ô tô đi từ A là

90 : (2 + 3) x 2 = 36 (km/h)

Vận tốc ô tô đi từ B là

90 - 36 = 54 (km/h)

Tổng vận tốc của 2 xe là :

      180 : 2 = 90 ( km / giờ )

Ta có sơ đồ :

Vận tốc ô tô từ A : |----|----|           90 km / giờ

Vận tốc ô tô từ B : |----|----|----|      

    Vận tốc của ô tô đi từ B là :

      90 : ( 3 + 2 ) x 3 = 54 ( km / giờ )

     Vận tốc của ô tô đi từ A là :

        90 - 54 = 36 ( km / giờ )

           Đáp số : Ô tô từ B : 54 km / giờ .

                          Ô tô từ A : 36 km / giờ .

DD
23 tháng 7 2021

Đổi: \(20'=\frac{1}{3}h\).

Khi người đi xe máy xuất phát thì người đi xe đạp đã đi được quãng đường là: 

\(18\times\frac{1}{3}=6\left(km\right)\)

Mỗi giờ người đi xe máy đi được nhiều hơn người đi xe đạp quãng đường là: 

\(36-18=18\left(km\right)\)

Hai người gặp nhau sau số giờ là: 

\(6\div18=\frac{1}{3}\left(h\right)\)

Đổi: \(\frac{1}{3}h=20'\).

Hai người gặp nhau lúc: 

\(6h+20'+20'=6h40'\)

DD
23 tháng 7 2021

Thời gian người đó đi (không kể thời gian nghỉ) là: 

\(1h+30'=1h30'\)

Đổi: \(1h30'=1,5h\).

Quãng đường Hà Nội đến Bắc Giang là: 

\(38\times1,5=57\left(km\right)\)

Người đó đến Bắc Giang lúc: 

\(6h30'+1h+15'+30'=8h15'\)

23 tháng 7 2021

ảnh con đĩ simmu

23 tháng 7 2021

46. Nobody in the class is cleverer than Sally

47. the exam was not as easy as we thought at first

48. ha had a toothache yesterday and so did we ( i)

49. is this the best motorbike you have ?

50. we didn't go on our picnic yesterday because the weather was bad

*Sxl

Sally is the cleverest student in the class. (than)

Nobody in the class is cleverer than Sally.

The exam was more difficult than we thought at first. (easy)

The exam was not easy as we thought at first.

. Ha had a toothache yesterday. We had a toothache yesterday. (so)

Ha had a toothache yesterday and so did we.

 Do you have a better motorbike than this? (the)

Is this the best motorbike you have?

. We didn’t go on our picnic yesterday because of the bad weather. (because)

We didn’t go on our picnic yesterday because the weather was bad.

23 tháng 7 2021

kêt quả là:

121/729 nha

hok tốt

cơ hội kiếm điểm lần 6 IX. Read the passage and answer the questions.             Frank is now the head of a very large business company, but as a boy he used to work in a small shop. It was his job to repair bicycles and at the time he used to work fourteen hours a day. He saved money for years and in 1938 he bought a small workshop of his own. During the war, Frank used to make spare part for planes. At that time he had two helpers. By the end of the war, the small workshop had...
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cơ hội kiếm điểm lần 6 

IX. Read the passage and answer the questions.

            Frank is now the head of a very large business company, but as a boy he used to work in a small shop. It was his job to repair bicycles and at the time he used to work fourteen hours a day. He saved money for years and in 1938 he bought a small workshop of his own. During the war, Frank used to make spare part for planes. At that time he had two helpers. By the end of the war, the small workshop had become a large factory which employed seven hundred and twenty-eight people. Frank smiled when he remembered his hard early years and the long road to success.

 * Questions:             

41. Where did Frank use to work when he was a boy?

® ____________________________________________________________

42. Did he use to work forty hours a day?

® ____________________________________________________________

43. When did he buy his own workshop?

® ____________________________________________________________

44. What did he use to do during the war?

® ____________________________________________________________

45. How many workers were there in Frank’s factory at the end of the war?

® ____________________________________________________________

5
23 tháng 7 2021

1. where did Frank use to work when he was a boy

=> Frank used to work in a small shop when he was a boy.

2. did he use to work forty hours a day

=> No, he didn't

3. when did he buy his own workshop

=> He bought his own workshop in 1938.

4. what did he use to do during the war

=> During the war, he used to make spare park foer planers.

5. how many workers were there in Frank í factory at the end of the war

=> At the end of the war, there were seven hundred and twenty-eight workers in his factory.

1. where did Frank use to work when he was a boy

=> Frank used to work in a small shop when he was a boy.

2. did he use to work forty hours a day

=> No, he didn't

3. when did he buy his own workshop

=> He bought his own workshop in 1938.

4. what did he use to do during the war

=> During the war, he used to make spare park foer planers.

5. how many workers were there in Frank í factory at the end of the war

=> At the end of the war, there were seven hundred and twenty-eight workers in his factory.

24 tháng 7 2021

1/

Tổng 2 số là

428x2=856

\(\overline{ab}+\overline{7ab}=\overline{ab}+700+\overline{ab}=856\Rightarrow2x\overline{ab}=156\Rightarrow\overline{ab}=78\)

2/

Chia số bi xanh thành 9 phần = nhau thì số bi đổ là 8 phần

Tổng số phần = nhau là

9+8=17 phần

Giá trị 1 phần là

170:17=10 viên

Số bi xanh là

9x10=90 viên

Số bi đỏ là

8x10=80 viên

cơ hội kiếm điểm lần 5VIII. Read and circle the best option A, B, C or D to complete the passage.Children in Vietnam go to school when (36) ______ are 6 years old. From 6 to 11 they are in primary schools. From 11 to 17 boys and girls in Vietnam go to secondary schools. In secondary schools they have a lot of (37)______. They learn (38)______ lots of different things. In Vietnam children (39)______ go to school on Sunday. They like to stay at school all day. They love to have lunch...
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cơ hội kiếm điểm lần 5

VIII. Read and circle the best option A, B, C or D to complete the passage.

Children in Vietnam go to school when (36) ______ are 6 years old. From 6 to 11 they are in primary schools. From 11 to 17 boys and girls in Vietnam go to secondary schools. In secondary schools they have a lot of (37)______. They learn (38)______ lots of different things. In Vietnam children (39)______ go to school on Sunday. They like to stay at school all day. They love to have lunch with their friends. (40)______ day at school is a happy day for them.

36. A. he                    B. they                        C. you                         D. we

37. A. class                B. studying                C. subjects                 D. subject

38. A. about               B. to                            C. by                           D. from

39. A. often               B. always                   C. usually                  D. never

40. A. each                B. a                             C. other                      D. others

7
23 tháng 7 2021

36. B

37. C

38. A

39. D

40. B

23 tháng 7 2021

36. B

37. C

38. A

39. D

40. B