Re Thursday's problem set: For …_欧洲杯在线买球_欧洲杯投注网站推荐@

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2011-09-21T00:26:15.000Z
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Re Thursday's problem set: For exam 2009 problem 2, please add the conditions x≥0 and y≥0. Hint: you do not need to check the axes, as xy=0 there, and the point you will find will have xy>0.