(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](/uploads/image/z/12510882-18-2.jpg?t=%EF%BC%881%EF%BC%891-x%26%23178%3B%2B2xy-y%26%23178%3B+%EF%BC%882%EF%BC%89x%26%23178%3B-y%26%23178%3B-z%26%23178%3B-2yz+%E5%88%86%E8%A7%A3%E5%9B%A0%E5%BC%8F)
(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)