x^3=y+7,y^3=x+7(x≠y),求x^3-2xy+y^3的值我不知道2009,你的解题步骤到(x+y)^3-(3(x+y)^2+1)+1)(x+y)=14就完全看不懂了,(x+y)^2+1=xy?“(*)只有一个实根,用matlab解”我也完全听不懂
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