计算（x-y-z)^2
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计算（x-y-z)^2计算（x-y-z)^2计算（x-y-z)^2给好评吗x2+y2+z2-2xy-2xz+2yz排列组合来做
计算（x-y-z)^2
计算（x-y-z)^2
计算（x-y-z)^2
给好评吗
x2+y2+z2-2xy-2xz+2yz
排列组合来做
计算（x-y-z)^2
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