Question

Tính nhanh:

152 + 197 + 129 + 171 + 213 + 168 + 155 + 295

Answer 1

152 + 197 + 129 + 171 + 213 + 168 + 155 + 295

= ( 152 + 168 ) + ( 197 + 213 ) + ( 129 + 171 ) + ( 155 + 295 )

= 320 + 410 + 300 + 450

= 730 + 300 + 450

= 1030 + 450

= 1480

Answer 2

=( 152+168)+ (197+213)+ (129+171)
= 320+410+300
=1030