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有这样一道题:"计算(2*x*x*x-3*x*x*y-2*x*y*y)-(x*x*x-2*x*y*y+y*y*y)+【-
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数学题已知p=x^/x-y-y^/x-y,q=(x+y)^-2Y(X+Y),
数学题,计算(2x+y)^2-2(2x+y)(x-2y)+(x-2y)^2
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