说明x²+y²+x²y²-6xy+15恒大于0
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说明x²+y²+x²y²-6xy+15恒大于0
说明x²+y²+x²y²-6xy+15恒大于0
说明x²+y²+x²y²-6xy+15恒大于0
化简 得:sqr(x+y)+sqr(xy-4) - 1=sqr(x+y)+(xy-3)(xy-5)
sqr指平方
讨论 xy>5或xy