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八年级数学压轴题，设正整数x，y满足xy-9x-9y=20，求 x²+y²值
八年级数学压轴题，设正整数x，y满足xy-9x-9y=20，求 x²+y²值
人教版八年级数学，最常考易错重要知识点、竞赛、综合压轴题168/209
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