Question

tính nhanh :

a) 1000 - ( 137 + 572 ) + ( 263 - 291)

b) -329 + ( 15 - 101 ) - ( 25 -440 )

Answer 1

a) 1000 - ( 137 + 572 ) + ( 263 - 291 )

= 1000 - 137 - 572 + 263 - 291

= 1000 - ( 137 + 572 + 291 ) + 263 

= 1000 - 1000 + 263

= 0 + 263

=263

b) -329 + ( 15 - 101 ) - ( 25 - 440 )

= -329 + 15 - 101 - 25 + 440

= ( -329 - 101 ) + 440 + 15 - 25

= -330 + 440 + 15 - 25

= 10 + 15 - 25 

= 0

Answer 2

1000-(137+572)+(263-291)

=1000-(137+572+291)+263

=1000-1000+263

=263

-329+(15-101)-(25-440)

=-329+15-101-25+440

=(-329+15-101-25)+440

=-440+440

=0

k mình nha...^_^...kb nữa...thanks♥