x^2 =2xy-y^2 求2x-3y /3x-2y 的值
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x^2 =2xy-y^2 求2x-3y /3x-2y 的值
x^2 =2xy-y^2 求2x-3y /3x-2y 的值
x^2 =2xy-y^2 求2x-3y /3x-2y 的值
x^2 =2xy-y^2
所以x^2 -2xy+y^2=(x-y)^2=0
x=y
2x-3y /3x-2y =-x/x=-1
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