9(x-y)2-12(y2-x2)+4(x+y)2 因式分解
1个回答
9(x-y)^2-12(y^2-x^2)+4(x+y)^2
=9x^2-18xy+9y^2-12y^2+12x^2+4x^2+8xy+4y^2
=25x^2-10xy+y^2
=(5x-y)^2
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