19 x ( 52 + 38 ) - 9 x ( 52 + 38 )= 19x90-9x90=90x(19-9)=90x10=900

2/5 : 3/7 x 3/7 : 2/5 + 2019=1+2019=2020

D

1. C

2. A

3. B

4. B

5.  D

1. older

2. the highest

3. larger than

4. more expensive than

5. worse than

6. easier than

7. better

8. friendlier

9. the most important

10. more difficult

a) x−(−15)=−13−(−85−13)

=> x+15=85

=>x=70

b) (−9−x)+(x−14)=17−(−8+x)

=>-9-x+x-14=17+8-x

=>-23=25-x

=>x=48

C

Không tán thành: 1,3

Tán thành: 2,4

1. In April. They can see a grand opening ceremony, an ao dai fashion show, a Dem Phuong Dong or oriental night show, royal court musk performances... and sporting activities.

2. Duong's family prepares a five-fruit tray, makes jam and Chung cakes.

3. Because there are so many interesting things to see and enjoy, it would take too long to describe them.

4. In Bac Ninh, on 12th of the first lunar month.

5. Because it's near Ha Noi, it takes place right after Tet holiday and is full of traditional events.

1.B   2. C   3.B