计算(x-2y+z)(z-x-2y),
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计算(x-2y+z)(z-x-2y),计算(x-2y+z)(z-x-2y),计算(x-2y+z)(z-x-2y),(x-2y+z)(z-x-2y)=（z-2y）²-x²=z
计算(x-2y+z)(z-x-2y),
计算(x-2y+z)(z-x-2y),
计算(x-2y+z)(z-x-2y),
(x-2y+z)(z-x-2y)
=（z-2y）²-x²
=z²-4yz+4y²-x²
(x-2y+z)(z-x-2y)=(z-2y+x)(z-2y-x)=(z-2y)(z-2y)-xx=zz+4yy-4zy-xx
(x-2y+z)(z-x-2y)
= [(z-2y)+x][(z-2y)-x]
= (z-2y)^2 - x^2
= z^2 - 4yz + 4y^2 - x^2
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