0.75*1.5+2.5*0.15=0.75*1.5+0.25*1.5=（0.75+0.25）*1.5
0.75x1.5+2.5x0.15=0.75*1.5+0.25*1.5=（0.75+0.25）*1.5=1*1.5=1.5
0.75x1.5+2.5x0.15怎样简算=0.15x（0.75x10+2.5）=0.15x10=1.5
