已知x²-3xy=5,xy+y²=3,求x²-2xy+y²的值
人气：201 ℃ 时间：2019-11-09 02:46:32
解答
x²-3xy=5,xy+y²=3,
x²-2xy+y²=x²-3xy+xy+y²=5+3 = 8
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