(x+y+z)(x-y+z)+(y-x+z)(y-x-z)求过程
问题描述:
(x+y+z)(x-y+z)+(y-x+z)(y-x-z)求过程
答
(x+y+z)(x-y+z)+(y-x+z)(y-x-z)
=(x+y+z)(x-y+z)-(y-x+z)(x-y+z)
=((x+y+z)-(y-x+z))(x-y+z)
=(2x)(x-y+z)
=2x(x-y+z)
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