(x-y+z)(x+y-z)计算

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(x-y+z)(x+y-z)计算(x-y+z)(x+y-z)计算(x-y+z)(x+y-z)计算(x-y+z)(x+y-z)=[x-(y-z)][x+(y-z)]平方差=x²-(y-z)&#

(x-y+z)(x+y-z)计算
(x-y+z)(x+y-z)计算

(x-y+z)(x+y-z)计算
(x-y+z)(x+y-z)
=[x-(y-z)][x+(y-z)] 平方差
=x²-(y-z)²
=x²-(y²-2yz+z²)
=x²-y²+2yz-z²

=[x-(y-z)][x+(y-z)]
=x²-(y-z)²
=x²-y²+2yz-z²

(x-y+z)(x+y-z)=【x-(y-z)】.【x+(y-z)】=x^2-(y-z)^2=??平方差公式自己算