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(x-y+z)²等于多少
人气:436 ℃ 时间:2020-04-12 01:11:24
解答
(x-y+z)^2
=(x-y)^2+2z(x-y)+z^2
=x^2-2xy+y^2+2xz-2yz+z^2
=x^2+y^2+z^2-2(xy+xz+yz).
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