0.3(x-9)=12.75
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0.3(x-9)=12.75
0.3(x-9)=12.75
0.3(x-9)=12.75
0.3(x-9)=12.75
x-9=12.75/0.3
x=9+42.5
x=51.5
12.75/0.3=42.5,
x=42.5+9
x=51.5
51.5
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0.3(x-9)=12.75
0.3(x-9)=12.75解方程
0.3X+0.6*(20-X)=9,求X
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x/x-2+x-9/x-7=x+1/x-1+x-8/x-6,
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