Question

28个0.25相乘再乘30个0.4相乘怎么巧算

Answer 1

28*0.25*30*0.4=7*（4*0.25）*6*（5*0.4）=7*1*6*2=84，求采纳~

Answer 2

0.25^28次方x0.4^30次方
=0.25^28次方x0.4^28次方x0.4²
=(0.25x0.4)^28次方x0.16
=0.1^28次方x16x0.1²
=0.1^30次方x16
=16x10^-30次方