Question

Tính nhanh : 15 x 1358 + 590 x 358 + 85 x 1358 -  490 x 179 x 2.

Answer 1

=1358 x (15+85)+358x(590-490)

=1358x100+358x100

=100x(1358+358)

=100x1716

=171600

 

Answer 2

= 1358 x ( 15 + 85) + 358 x ( 590 - 490)

= 1358 x 100 + 358 x 100

= 100 x ( 1358 + 358 ) 

= 100 x 1716 = 171600