巧解下题：-1.53*0.75-0.53*（-0.75）-3.4*0.75=?要过程!

原式=0.75（-1.53+0.53-3.4）
=0.75*（-4.4）
=-3.3

提出0.75，0.75*(1.53+0.53-3.4)=0.27

-1.53×0.75-0.53×(-0.75)-3.4×0.75
=(-1.53+0.53-3.4)×0.75
=-4.4×0.75
=-1.1×4×3/4
=-1.1×3
=-3.3