2/8乘1/10+2/10乘1/12+2/12乘1/14+2/14乘1/16

问题描述:

2/8乘1/10+2/10乘1/12+2/12乘1/14+2/14乘1/16
+2/12乘1/14+2/14乘1/16

原式=1/10(1/4+1/6)+1/14(1/6+1/8)
=1/10*10/24+1/14*14/48
=1/24+1/48
=3/48
即原式等于48分之3