(2/15+3/4+5/12)乘60简便运算 5/27乘(1/4+1/5)简便运算 7/4乘17-(2/15+3/4+5/12)乘60简便运算5/27乘(1/4+1/5)简便运算7/4乘17-3/4
问题描述:
(2/15+3/4+5/12)乘60简便运算 5/27乘(1/4+1/5)简便运算 7/4乘17-
(2/15+3/4+5/12)乘60简便运算
5/27乘(1/4+1/5)简便运算
7/4乘17-3/4
答
(2/15+3/4+5/12)乘60=2/15乘60+3/4乘60+5/12乘60=8+45+25=685/27乘(1/4+1/5)=5/27乘1/4+5/27乘1/5=5/108+1/27=5/108+4/108=9/108=1/127/4乘17-3/4=(1/4)(7×17-3)=(1/4)×116=29