Vậy 3-n=2

=>n=1.

A +3.

B + 5. 

C + 4.

D + 1.

A−B=(2017⋅2016+1009)−(2018⋅2016−1007)

A−B=4066272+1009−4067281

A−B=1009−1009

A−B=0.

B nha.

Câu 1: 

Số thứnhất là 108x3/4=81

Số thứ hai là 108-81=27

-3 lần tổng của 3 số là: 162 + 136 + 148 = 446

-Tổng 3 số là: 446 : 2 = 223

-Số thứ nhất là: 223 - 136 = 87

-Số thứ hai là: 223 - 148 = 75

-Số thứ ba là: 223 - 162 = 61.

IV.

1. for

2. at

3. between

4. for

5. in

1. noisy

2. teeth

3. bakery

4. teacher

5. sailing

6. fifth

7. usually

8. student

9. children

10. nationality

V.

1. to the supermarket on foot.

2. has many flowers.

3. to work by bicycle?

4. there twenty - five students in your class?

5. quarter to eight.

6. do these flowers cost?

4. Minh hates going hiking at weekend.

6. Would you like to come to our house for dinner?

7. My favorite subject is Literature.

1. luckier - luckiest

2. better - best

3. more dangerously - the most dangerously.

4. colder - coldest

5. more important - the most important

6. braver - bravest

7. faster - fastest

8. thinner - thinnest