4-4x^2+4xy-y^2; -4xy+4y^2-2x+4y+1因式分解
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4-4x^2+4xy-y^2;-4xy+4y^2-2x+4y+1因式分解4-4x^2+4xy-y^2;-4xy+4y^2-2x+4y+1因式分解4-4x^2+4xy-y^2;-4xy+4y^2-2x+
4-4x^2+4xy-y^2; -4xy+4y^2-2x+4y+1因式分解
4-4x^2+4xy-y^2; -4xy+4y^2-2x+4y+1因式分解
4-4x^2+4xy-y^2; -4xy+4y^2-2x+4y+1因式分解
4-4x^2+4xy-y^2
=4-(4x²-4xy+y²)
=2²-(4x-y)²
=(2-4x+y)(2+4x-y)
-4xy+4y^2-2x+4y+1
=4y²+4y+1-4xy-2x
=(2y+1)²-2x(2y+1)
=(2y+1)(2y-2x+1)
4-4x²+4xy-y²=4－﹙4x²－4xy＋y²﹚=2²－﹙2x－y﹚²=﹙2＋2x－y﹚﹙2－2x＋y﹚
-4xy+4y²-2x+4y+1=4y²+4y+1－﹙4xy+2x﹚=﹙2y＋1﹚²－2x﹙2y＋1﹚=﹙2y＋1﹚﹙2y＋1－2x﹚
(x^2+2xy+y^2-4xy)*(x^2-2xy+y^2+4xy)
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