1.X-9分之1X=20
(8/9)x=20
x=22.5
2.3分之4乘5+3分之X=12
20/3+x/3=12
20+x=36
x=16
3.1+8分之3X=5分之4除3分之2
1+3x/8 = 6/5
40+15x = 48
15x = 8
x = 8/15
4.X-30分之11X=57
30x - 11x = 1710
19x = 1710
x = 90
5.0.5X除5分之2=72乘4分1
x/2 × 5/2 = 18
5x/4 =18
x = 72/5
6.5分之4X=60%乘2分之1
4x/5=3/10
x=3/8