hieu cua hai so la 

425 + 826 = 1251

so lon la

(105437 + 1251 ) : 2 = 53344

so be la 

105437 - 53344 = 52093 

UNESCO was established to encourage collaboration......nations in the areas......education, science, culture, and communication.

A. between - in

B. among - of

C. between - of

D. among - in

1A

2C

3B

4F

5D

6E

Tick cho minh nhe

1 finishes

2 will/eat

3 playing

service

concerned

1 C

2 A

1. intelligent

2 biggest