(1)1-x²+2xy-y² (2)x²-y²-z²-2yz 分解因式

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(1)1-x²+2xy-y² (2)x²-y²-z²-2yz 分解因式

(1)1-x²+2xy-y² (2)x²-y²-z²-2yz 分解因式
(1)1-x²+2xy-y² (2)x²-y²-z²-2yz 分解因式

(1)1-x²+2xy-y² (2)x²-y²-z²-2yz 分解因式
(1)1-x²+2xy-y²
=1-(x-y)²
=(1-x+y)(1+x-y)
(2)x²-y²-z²-2yz
=x²-(y+z)²
=(x+y+z)(x-y-z)

(1) 1-x²+2xy-y²
=1-(x²-2xy+y² )
=1- (x-y)²
=(1-x+y)(1+x-y)
(2) x²-y²-z²-2yz
=x²-(y²+z²+2yz)
=x²- (y+z)²
=(x+y+z)(x-y-z)