5*(1/15+2/17)*17可以简便计算就简便计算

问题描述:

5*(1/15+2/17)*17可以简便计算就简便计算

(5/15)*17+(10/17)*17
=17/3+10
=15(2/3)
15又2/3

5*(1/15+2/17)*17
=(5*1/15+5*2/17)*17
=17(1/3+10/17)
=17/3+17*10/17
=17/3+10
=15又2/3