分解因式:(1+y)^2-2x^2(1+y^2)+x^2(1-y)^2
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(1+y)^2-2x^2(1+y^2)+x^2(1-y)^2
=(1+y)²-x²(2+2y²-1+2y-y²)
=(1+y)²-x²(y²+2y+1)
=(1+y)²-x²(y+1)²
=(1+y)²(1-x)(1+x)
=(1+y)²-x²(2+2y²-1+2y-y²)
=(1+y)²-x²(y²+2y+1)
=(1+y)²-x²(y+1)²
=(1+y)²(1-x)(1+x)
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原式=1+y^2+2y-2x^2-2x^2y^2+x^2+x^2y^2-2x^2y
=y^2(1-x^2)+(1-x^2)+2y(1-x^2)
=(y^2+2y+1)(1-x^2)
=(y+1)^2(1+x)(1-x)
=y^2(1-x^2)+(1-x^2)+2y(1-x^2)
=(y^2+2y+1)(1-x^2)
=(y+1)^2(1+x)(1-x)
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(1+y)^2-2x^2(1+y^2)+x^2(1-y)^2=
(1+y)^2-x^2{2+2y^2+(1-y)^2}=
(1+y)^2-x^2(1+y)^2=
(1+y)^2(1+x)(1-x)
(1+y)^2-x^2{2+2y^2+(1-y)^2}=
(1+y)^2-x^2(1+y)^2=
(1+y)^2(1+x)(1-x)
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原式=(1+y)-x²(2+2y²-1+2y-y²)
=(1+y)²-x²(1+2y+y²)
=(1+y)²-x²(1+y)²
=-(1+y)²(x²-1)
=-(y+1)²(x+1)(x-1)
=(1+y)²-x²(1+2y+y²)
=(1+y)²-x²(1+y)²
=-(1+y)²(x²-1)
=-(y+1)²(x+1)(x-1)
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