①3分之2x+5分之3x=12
(2/3+3/5)x=12
19/15x=12
x=12*15/19
x=180/19(19分之180)
②9分之5+2x=3分之2
2x=2/3-5/9
2x=1/9
x=1/9÷2
x=1/18
③4x+2分之1x=9
(4+1/2)x=9
9/2x=9
x=9*2/9
x=2
④5x+2分之9=6
5x=6-9/2
6x=3/2
x=3/2÷6
x=1/4
⑤2x+5分之4=2
2x=2-4/5
2x=6/5
x=6/5÷2
x=3/5
1 . X=180/19
2. X=1/18
3. X=2
4. X=3/10
5. X=3/5