Question

Tính nhanh :

- 67 +  24 +  ( 67 - 24 +  93 +  7 )

Answer 1

- 67 + 24 + ( 67 - 24 + 93 + 7 )

= - 67 + 24 + 67 - 24 + 93 + 7

= ( - 67 + 67 ) + ( - 24 + 24 ) + 93 + 7

= 0 + 0 + 93 +7

= 100