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笔者最近发现1998年“希望杯”数学邀请赛(高二,第二试)试题第9题是一道错题,原题如下: 二元函数(x-y)~2+(x+1/y+1)~2的最小值是 ( )
The author recently discovered that the 9th question of the 1998 “Hope Cup” Math Invitational (high 2 and 2) is a wrong question. The original question is as follows: Binary function (xy)~2+(x+1/y+1)~ The minimum value of 2 is ()