3y=2x,两边同时乘以1/3x可得y/x=2/3;y/3=x/2,两边同时乘以3/x可得y/x=3/2;12/x=9y,两边都乘以x/9可得x/y=4/3.
3y=2x y/3=x/2 12/x=9/y y/x=?y/x=?x/y=?
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