-1.53×0.75＋1.53×2分之1＋4分之5×1.53
=1.53×(0.5-0.75+5/4)
=1.53×1
=1.53为什么“-1.53×0.75＋1.53×2分之1＋4分之5×1.53中“-1.53”直接变成1.53×(0.5-0.75+5/4)-1.53×0.75＋1.53×2分之1＋4分之5×1.53把公因式1.53提到外面=1.53×(-0.75+1/2+5/4)=1.53×(0.5-0.75+1.25)=1.53×1=1.53