Question

a)79+1011;b)291+20008+250;c)1811+15+189+185?

 

Answer 1

`a)79+1011=1090`

`b)291+20008+250=20299+250=20549`

`c)1811+15+189+185=(1811+189)+(15+185)=2000+200=2200`

Answer 2

đề bài là j v bn?