7x^2-12xy+5y^2=0 怎样化成(7x-5y)(x-y)=0
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7x^2-12xy+5y^2=0 怎样化成(7x-5y)(x-y)=0
![7x^2-12xy+5y^2=0 怎样化成(7x-5y)(x-y)=0](/uploads/image/z/20069206-70-6.jpg?t=7x%5E2-12xy%2B5y%5E2%3D0+%E6%80%8E%E6%A0%B7%E5%8C%96%E6%88%90%287x-5y%29%28x-y%29%3D0)
7x^2-12xy+5y^2=0
7x^2 - 5xy - 7xy + 5y^2 = 0
x(7x -5y) -y(7x - 5y) = 0
(7x-5y)(x-y)=0
7x^2 - 5xy - 7xy + 5y^2 = 0
x(7x -5y) -y(7x - 5y) = 0
(7x-5y)(x-y)=0
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