(m+n)x^2+2xy(n-2m)+(4m+n)y^2
1个回答
(m+n)x^2+2xy(n-2m)+(4m+n)y^2
=mX^2-4mXY+4mY^2 + nX^2+2nXY+nY^2
=m(X-2Y)^2+n(X+Y)^2
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