x^2-4xy+4y^2=16(x+y)^2-x-y-12=0
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![x^2-4xy+4y^2=16(x+y)^2-x-y-12=0](/uploads/image/z/12508409-65-9.jpg?t=x%5E2-4xy%2B4y%5E2%3D16%28x%2By%29%5E2-x-y-12%3D0)
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x^2-4xy+4y^2=16(x+y)^2-x-y-12=0
x^2-4xy+4y^2=16
(x+y)^2-x-y-12=0
x^2-4xy+4y^2=16(x+y)^2-x-y-12=0
^ 是什么意思?