1、5/12X-1/2+2/3=1
5/12X=1+1/2-2/3
5/12X=6/6+3/6-4/6
X=5/6÷5/12
X=5/6×12/5
X=2
2、X-15%X=1.7
0.85X=1.7
X=1.7÷0.85
X=2
3、5/7X÷5/14=7/8
X=7/8×5/14÷5/7
X=7/16
1、5/12X-1/2+2/3=1
5/12X=1+1/2-2/3
5/12X=6/6+3/6-4/6
X=5/6÷5/12
X=5/6×12/5
X=2
2、X-15%X=1.7
0.85X=1.7
X=1.7÷0.85
X=2
3、5/7X÷5/14=7/8
X=7/8×5/14÷5/7
X=7/16