计算:(2x+y-z)^2 就这一题.计算:(2x+y-z)^2
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计算题(x+y)^2(y+z-x)(z+x-y)+(x-y)^2(x+y+z)(x+y-z).
计算(x-y-z)^2
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计算:(2x+y-z)^2 就这一题.计算:(2x+y-z)^2
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