[2-(5.55×1又3分之1-2又10分之7)]÷0.9

问题描述:

[2-(5.55×1又3分之1-2又10分之7)]÷0.9

[2-(5.55×1又3分之1-2又10分之7)]÷0.9
=[2-(5.55×4/3-27/10)]÷0.9
=[2-(222/30-81/30)]÷0.9
=[60/30-141/30]÷9/10
=[-27/10]*10/9
=-3