Độ dài quãng đường AB là:

52 x 3,5= 182 (km)

Số giờ xe máy đi quãng đường AB với vận tốc 42km/h là:

182: 42= \(\dfrac{13}{3}\)(giờ)

Số tuổi của cháu là:

\(\dfrac{2}{3}\) x 63= 42 (tuổi)

bạn ơi bài 4 cũng đừng bê nguyên xi của mình như thế chứ ạ :(((

Gọi số hàng ở kho thứ 1: x

     số hàng ở kho thứ 2: 120-x

Sau khi chuyển 30 tấn hàng từ kho 1 sang kho 2:

số hàng ở kho 1: x-30

số hàng ở kho 2: 150-x

Theo đề ta có:

2(x-30)= 150-x

2x - 60 = 150 -x

2x + x= 150 + 60

3x= 210

x= 70

Vậy số hàng ở kho 1 là 70 tấn

Số hàng ở kho 2 là:

120- 70= 50 (tấn)

1. He started playing tennis 10 years ago.

2. In spite of being poor, Peter always believes his better life in the future.

3. The bomb was being carried to a safe place.

IV.

1. Sydney is the cleanest city in the world.

2. We visited our grandparents in the countryside last week.

3. New York is the biggest city in the world.

4. They went to their parents in the countryside last week.

5. Mr. Nam does not have much time to write to his friends.

4. Theo đề ta có:

\(\dfrac{51-a}{78-a}\)=\(\dfrac{5}{8}\)

8 x (51-a) = 5 x (78-a)

408 - 8a = 390 - 5a

408 - 8a - 5a= 390

480 - 3a = 390

3a = 480 -390

3a= 90

a= 30 

Vậy a là 30

36. the tourist asked me how much time we taked to get there by bus.

37. the examiner asked Hoa how often she went fishing.

38. Tuan asked Ba how many people was there in their family.

39. She asked Mrs. Lam how her children enjoyed the trip. 

40. The salesman asked Mrs. Brown what size of shoes she wanted.

1. Tom asked Liz where she was going.

2. Tom asked Hoa if she liked that place.

3. Mr. Nam asked to give him a cup of coffee.

4. Mike said that he couldn't go to school that day because he was ill.

5. Vicky said that she didn't know where Archie was.

6. Andrew said to Anne to turn the music down.

7. (?)

8. The boy said that he had no idea. He just went along to see what would happen.

9. the police asked Sandra if this her father's car.

10. the teacher said to his student to listen to her and don’t make a noise.

40