Question

Bỏ dấu ngoặc rồi tính :

a) ( 27 +  65 ) + ( 346 - 27 - 65 )

b) ( 42 - 69 + 17 ) - ( 42 + 17 )

 

Answer 1

a) ( 27 +  65 ) + ( 346 - 27 - 65 )= 27+65 + 346-27-65 = 346

b) ( 42 - 69 + 17 ) - ( 42 + 17 )= 42-69+17 - 42-17= -69

Answer 2

a)(27+65)+(346-27-65)=27+65+346-27-65=(27-27)+(65-65)+346=0+0+346=346

b)(42-69+17)-(43+17)=42-69+17-42-17=(42-42)+(17-17)-69=0+0-69=-69

Tick cho mình nha bạn !!