0.64×25×7.8+2.2 的简便运算

问题描述:

0.64×25×7.8+2.2 的简便运算

=16*0.04*25*7.8+2.2
=16*1*7.8+2.2
=15*(8-0.2)+7.8+2.2
=120-3+10
=127