gia

giải giúp mình với bài 3,5 nha ! thank you mn

were 

bài đâu rùi bn

11. IN

12. AT

13. AT

 

Gọi số bé là  thì số lớn là  . Theo đề bài ta có

a) a2 - 4b2 = a2 -( 2b)2 = ( a - 2b ) a + 2b

CHÚC BN HOK TỐT

A)

1. AT

2. ON

3. AT – AT

4. IN

5. IN

6. ON

7. IN

8. AT

9. ON

10. AT

11. IN

12. ON

B)

1. IN

2. AT

3. ON

4. AT

5. ON

6. AT

7. IN

8. IN

9. AT

10. IN

VI. Fill in each gap with ONE suitable word.

Viet Nam is in the South- East Asia. It has (1)__lots______of beautiful mountains, rivers and beaches. (2)__there______are two long (3)___river_____in Viet Nam: the Red River in the north and the Mekong River in the (4)__world______. The Mekong River is the (5)____longest____river in the South- East Asia and of course it is longer (6)____than____the Red River. The Mekong River starts in Tibet and flows (7)____in____ the sea. Phanxipang is the (8)___highest_____mountain in Viet Nam. It’s 3,143 meters (9)__high

______. Viet Nam also (10)___has_____a lot of nice beaches such as Sam Son, Do Son, Nha Trang, Vung Tau.