Question

[Nguyễn Vũ Phương linh]

Tính  nhanh 

A, 325+612+675+388

B, 268 ✖ 8+315 ✖ 33+315

C, 315 ✖ 66+315 ✖ 33+325

D, 2017 ✖ 19-2017 ✖ 8-2017

E, 3150-267-315-733-685

Answer 1

[Trịnh Thị Thúy Loan]

 A) 325 + 612 + 675 + 388

= ( 325 + 612 ) + ( 675 + 388 )

=  937 + 1063

= 2000

 B) 268 x 8 + 315 x 33 + 315

= ( 268 x 8 ) + ( 315 x 33 ) + 315

= 2144 + 10395 + 315

= 12539 + 315

= 12854

 C) 315 x 66 + 315 x 33 + 325

= ( 315 x 66 ) + ( 315 x 33 ) + 325

= 20790 + 10395 + 325

= 31185 + 325

= 31510

 D) 2017 x 19 - 2017 x 8 - 2017

= ( 2017 x 19 ) - ( 2017 x 8 ) - 2017

=38323 - 16136 -2017

= 22187 - 2017

= 20170

 E) 3150 - 267 - 315 - 733 - 685

= ( 3150 - 267 ) - 315 - ( 733 - 685 )

= 2883 - 315 - 48

= 2568 - 48

= 2520