解方程,- 6分之x-7分之x=84 x-6分之1x=9 3.5*2-0.2x=2 30%x+15=906分之x-7分之x=84x-6分之1x=93.5*2-0.2x=230%x+15=90

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解方程,- 6分之x-7分之x=84 x-6分之1x=9 3.5*2-0.2x=2 30%x+15=906分之x-7分之x=84x-6分之1x=93.5*2-0.2x=230%x+15=90
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解方程,- 6分之x-7分之x=84 x-6分之1x=9 3.5*2-0.2x=2 30%x+15=906分之x-7分之x=84x-6分之1x=93.5*2-0.2x=230%x+15=90
解方程,- 6分之x-7分之x=84 x-6分之1x=9 3.5*2-0.2x=2 30%x+15=90
6分之x-7分之x=84
x-6分之1x=9
3.5*2-0.2x=2
30%x+15=90

解方程,- 6分之x-7分之x=84 x-6分之1x=9 3.5*2-0.2x=2 30%x+15=906分之x-7分之x=84x-6分之1x=93.5*2-0.2x=230%x+15=90
(1)6分之x-7分之x=84
x/42=84
x=42*84=3528
(2)x-x/6=9
5x/6=9
x=54/5=10.8
(3)3.5*2-0.2x=2
0.2x=5
x=25
(4)30%x+15=90
0.3x=75
x=250