(X-210+0.2X):(210-0.2X)=3:2

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(X-210+0.2X):(210-0.2X)=3:2(X-210+0.2X):(210-0.2X)=3:2(X-210+0.2X):(210-0.2X)=3:2(X-210+0.2X):(210-0

(X-210+0.2X):(210-0.2X)=3:2
(X-210+0.2X):(210-0.2X)=3:2

(X-210+0.2X):(210-0.2X)=3:2
(X-210+0.2X):(210-0.2X)=3:2
(1.2X-210):(210-0.2X)=3:2
2(1.2X-210)=3(210-0.2X)
2.4x-420=630-0.6x
2.4x+0.6x=630+420
3x=1050
x=350

(X-210+0.2X):(210-0.2X)=3:2
合并同类项得: (1.2x-210)∶(210-0.2x)=3∶2
两边同时乘以 2(210-0.2x)得:2(1.2x-210)=3(210-0.2x)
2.4x-420=630-0.6...

全部展开

(X-210+0.2X):(210-0.2X)=3:2
合并同类项得: (1.2x-210)∶(210-0.2x)=3∶2
两边同时乘以 2(210-0.2x)得:2(1.2x-210)=3(210-0.2x)
2.4x-420=630-0.6x
移项得:2.4x+0.6x=630+420
合并同类项得: 3x=1050
∴ x=350

收起

令Y=210-0.2X则
(X-Y):Y=3:2
=>X:Y=(3:2)+1=5:2
=>X:(210-0.2X)=5:2
=>2X=5(210-0.2X)
=>3X=5*210
=>X=5*70=350