(m+n)x^2+2xy(n-2m)+(4m+n)y^2
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(m+n)x^2+2xy(n-2m)+(4m+n)y^2(m+n)x^2+2xy(n-2m)+(4m+n)y^2(m+n)x^2+2xy(n-2m)+(4m+n)y^2(m+n)x^2+2xy(n-2
(m+n)x^2+2xy(n-2m)+(4m+n)y^2
(m+n)x^2+2xy(n-2m)+(4m+n)y^2
(m+n)x^2+2xy(n-2m)+(4m+n)y^2
(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
(m+n)x^2+2xy(n-2m)+(4m+n)y^2
若x²y+M=xy(N+2xy),则M=( ),N=( )
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