X-8/5=2-1.25 9/7=1+X-3/1 2/1+4.7=5+X
问题描述：
X-8/5=2-1.25 9/7=1+X-3/1 2/1+4.7=5+X
答
X-8/5=2-1.25
x=5/8+0.75
x=5/8+6/8
x=11/8
9/7=1+X-3/1
x=7/9-2/3
x=7/9-6/9
x=1/9
2/1+4.7=5+X
0.5+4.7=5+x
x=5.2-5
x=0.2
x=1/5