分解因式1-x2+2xy-y2

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分解因式1-x2+2xy-y2分解因式1-x2+2xy-y2分解因式1-x2+2xy-y21-x^2+2xy-y^2=1-(x^2-2xy+y^2)=1^2-(x-y)^2=(1-x+y)(1+x-y

分解因式1-x2+2xy-y2
分解因式1-x2+2xy-y2

分解因式1-x2+2xy-y2
1-x^2+2xy-y^2
=1-(x^2-2xy+y^2)
=1^2-(x-y)^2
=(1-x+y)(1+x-y)

=1-(x-y)的平方
=(1-x+y)
9
=
= (1-x+y)( 1+x-y )