1-x^2+4y(x-y)因式分解

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1-x^2+4y(x-y)因式分解1-x^2+4y(x-y)因式分解1-x^2+4y(x-y)因式分解1-x^2+4y(x-y)=1-x^2-4xy-4y^2=1-(x-2y)^2=(1+x-2y)(

1-x^2+4y(x-y)因式分解
1-x^2+4y(x-y)因式分解

1-x^2+4y(x-y)因式分解
1-x^2+4y(x-y)
=1-x^2-4xy-4y^2
=1-(x-2y)^2
=(1+x-2y)(1-x+2y)

1-x^2+4y(x-y)
=1-x^2+4xy-4y^2
=-1(x^2-4xy+4y^2)
=-1(x-2y)^2