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Tenshi幻(6024*****) 19:52:50 正数x, y x^3+y^3+xy^2+x^2y-2x^2-2y^2-2xy+2>=0
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配平方: 1/4*(x-1)^2*(3*x+y)+1/4*(y-1)^2*(3*y+x)+1/4*(x+y+2)*(x-2+y)^2. 初来咋到,环境不熟,多多关照 ... szl6208 发表于 2013-9-30 19:17
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2025-7-21 16:38 GMT+8
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