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,