1. B

2. B

3. C

4. A

5. C

6. B

7. C

8. D

9. B

10. D

Câu 1: 1228

Câu 2 : 507 cm 2

Câu 3: 10 000 000 đồng 

Câu 4: 46

Câu 5: 85,2 kg 

Câu 6: 45 quyển 

Câu 7: 23780 

Câu 8 : 43 kg 

Câu 9 : 48 

Câu 10 :  6 

Tick mk nha ,mk làm nhọc lém đó 

1. A letter should always end with the signof the write.

2. Don't be so noise. My father is sleeping

3. Sorry about the mistakes, I understand the instructyou gave me.

4. The use of spaceis very interesting and explore

5. Sue seems to have thestudy ideathat she can succeed without mistake.

Trong 1 giờ ca nô xuôi dòng được \(\frac{1}{2}\) quãng sông ; ngược dòng được \(\frac{2}{5}\) quãng sông .

Trong 1 giờ khóm bèo đó trôi được :

\(\left(\frac{1}{2}-\frac{2}{5}\right):2=\frac{1}{20}\) ( quãng sông )

Thời gian khóm bèo trôi từ a đến b là :

\(1:\frac{1}{20}=20\) ( giờ )

Tick nhé

21. Ba gets to work by motorbike.

22. There are six hundred students in my school.

23. Jack is Julia's sister.

24. The bank is in front of the supermarket.

25. The children are going to school on foot now.

26. Hung is taller than Nam.

27. Why don't we go camping in Suoi Mo.

28. How much does a bottle of cooking oil cost ?

29. Nga usually go to school on foot.

30. Hoang is the fattest student in my class.

31. When does she go to school.

32. Her favourite food is noodles.

1. play

2. won't have

3. won't go

4. works

5. doesn't have

6. doesn't have

7. misses

8. lives

9. will meet

10. will meet

11. to see

12. meet

13. will come

14. will go

15. are playing

16. plays

17. have

18. goes

19. is knocking

20. is reading

3x -2 = (2x +1) + x -3 chia hết cho  2x+1

khi x-3 chia hết cho 2x+1

=>x -3 =0 => x =3

hoặc x -3 = 2x+1 => x =-4

        x -3 = -2x -1 => 3x = 2 loại

Vậy x =3 ; x =-4

1. School finishes at 4.30 p.m everyday.

2. Listen! Are they singing in the classroom ?

3. Where are you, Phong ?

- I'm upstairs. I am doing my homework.

4. My family likes spending our summer holidays at the seaside.

5. It's warm today. I don't want to stay at home now. What about going swimming ?

6. Do you often eat lunch in the school canteen ?

Một người trong 1 ngày đào được: 36:10=3,6( m)

25 người trong 1 ngày đào được: 3,6x25=90 (m)

ĐS: 90 (m)