(1又4/5-2又5/6+3又7/10-4又8/15)/(-1/30)

问题描述:

(1又4/5-2又5/6+3又7/10-4又8/15)/(-1/30)

(1又4/5-2又5/6+3又7/10-4又8/15)/(-1/30)
=(1又4/5-2又5/6+3又7/10-4又8/15)×(-30)
=-1又4/5×30+2又5/6×30-3又7/10×30+4又8/15×30
=-54+85-111+136
=56