-x+2x^2-x^3x^3z-4x^2yz+4xy^2z(m+n)^2-4m(m+n)+4m^2
4个回答
-x+2x^2-x^3
=-x(x-1)^2
x^3z-4x^2yz+4xy^2z
=xz(x-2y)^2
(m+n)^2-4m(m+n)+4m^2
=(n-m)^2
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