900/x=2*600/(x-30)
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900/x=2*600/(x-30)900/x=2*600/(x-30)900/x=2*600/(x-30)得900*（x-30)=2*600x900x-27000=1200x-300x=27000x
900/x=2*600/(x-30)
900/x=2*600/(x-30)
900/x=2*600/(x-30)
得 900*（x-30)=2*600x
900x-27000=1200x
-300x=27000
x=90
900/x=2*600/(x-30)
两边除以300
3/x=4/(x-30)
3(x-30)=4x
3x-90=4x
x=-90
900/x=2*600/(x-30)
9/x=2*6/(x-30)
3/x=4/(x-30)
3(x-30)=4x
3x-90=4x
4x-3x=-90
x=-90
经检验x=-90是方程的解
900/x=2*600/(x-30)
3(x-30)=4x
3x-90=4x
4x-3x=-90
x=-90
900/x=2*600/(x-30)
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