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^2-12xy+5y^2=0 怎样化成(7x-5y)(x-y)=0
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