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x3-y3-3xy=1 x-y=?
人气:160 ℃ 时间:2019-12-13 17:23:17
解答
(x-y)^3=x³-3x²y+3xy²-y³ 则
x3-y3-3xy=1
(x-y)^3+3x²y-3xy²=1
(x-y)^3+3xy(x-y)=1
(x-y)((x-y)2+3xy)=1
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