15-3.75×10%-5/8 解=120/8-5/8-0.375 =115/8-3/8 =112/8 =14 9/5×25%+1/4×2.2-0.25 解=9/5×1/4+1/4×2.2-1/4 =1/4×(1.8+2.2-1) =1/4×3 =3/4 就是这样,