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x2+y2+z2-2xy+2yz+2zx=?
人气:394 ℃ 时间:2020-04-30 20:40:15
解答
x^2+y^2+z^2-2xy+2yz+2zx
=(x^2-2xy+y^2)+2(x+y)z+z^2
=(x-y)^2+2(x+y)z+z^2
=(x-y+z)^2
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