1.4/3:x=6/5
4:3x=6:5
18x=20
x=10/9
x=1又 1/9
2.x-3/2x=9/2
-x/2=9/2
x=-9
3.4÷3/2x=5/2
解4=3/2x.5/2
15/4 x=4
x=16/15
x=1 又 1/15