简便计算:(1/6-3/14+2/3-2/7)/(-1/42)

问题描述:

简便计算:(1/6-3/14+2/3-2/7)/(-1/42)

将42乘进去得到-7+9-28+12=-14

=(1/6-3/14+2/3-2/7)×(-42)
=-7+9-28+12
=-14