56×75%—46×3/4
=（56-46）X75%
=7.5
8×75%—3÷3/4
=6-4
=2
8.5×0.75+7.5×75%
=(8.5+7.5)X0.75
=12
101×0.375—37.5%
=(101-1)X0.375
=37.5
3/5÷60%×（3/4+1/2）
=1X1.25
=1.25
5/8—5/6×（1/4+25%）（都要有过程）
=5/8-5/12
=5/24
解方程：X—15%X=8.5
0.85X=8.5
X=10
10+15%X=17.5
0.15X=7.5
X=50