一道分数题

问题描述:

一道分数题
7.42-(5又5分之3-1.35)-1又4分之3

7.42-(5又5分之3-1.35)-1又4分之3
=7.42-5×17/4-1又3/4
=7.42-21又1/4-1又3/4
=7.42-(21又1/4+1又3/4)
=7.42-23
=-15.58为什么有×。。。马虎了:7.42-(5又5分之3-1.35)-1又4分之3=7.42-41/4-1又3/4=7.42-(4又1/4+1又3/4)=7.42-6=1.42好吧好好