3.75*4.8+62.5*0.48=3.75*4.8+6.25*4.8=（3.75+6.25）*4.8=10*4.8=48
=37.5*0.48+62.5*0.48=（37.5+62.5）*0.48=100*0.48=48
（3.75+6.25）×4.8=48
