
(x+2y-z)(x-2y+z)-(x+2y+z)² 详细过程
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原式等价于(x+2y-z)(x-2y+z)-(x+2y+z)(x+2y+z)
=[x+(2y-z)][x-(2y-z)]-[x+(2y+z)][x+(2y+z)]
=x2-(2y-z)2-[x2+(2y+z)2-2x(2y+z)]
=-(2y-z)2-(2y+z)2+2x(2y+z)
=-4y2-z2+4yz-4y2-z2-4yz+4xy+2xz
=-4y2-2z2+4xy+2xz
=[x+(2y-z)][x-(2y-z)]-[x+(2y+z)][x+(2y+z)]
=x2-(2y-z)2-[x2+(2y+z)2-2x(2y+z)]
=-(2y-z)2-(2y+z)2+2x(2y+z)
=-4y2-z2+4yz-4y2-z2-4yz+4xy+2xz
=-4y2-2z2+4xy+2xz
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