5.6乘以3又4分之3减4又5分之2乘以3.75+0.88乘以37又2分之1
=5.6×3.75-4.4×3.75+0.88×37.5
=5.6×3.75-4.4×3.75+8.8×0.1×37.5
=（5.6-4.4+8.8）×3.75
=10×3.75
=37.5