3.12*4+1.88*4=(3.12+1.88)*4=20
0.88*105-0.88*5=(105-5)*0.88=88
0.75*99+0.75=(99+1)*0.75=75
3.12*4.7+4.7*5.88+4.7=(3.12+5.88+1)*4.7=47
8*0.6+12*0.6-3.2*0.6=(8+12-3.2)*0.6=10.08
1.53+3.62+0.38+4.47=(1.53+4.47)+(3.62+0.38)=6+4=10
7.35-0.73-1.27=7.35-(0.73+1.27)=7.35-2=5.35
9.6*28.5+0.285*40=96*2.85+4*2.85=(96+4)*2.85=100*2.85=285