- 問題詳情:Mostofyouknowthismathematicalgame,ofcourse.Youandyourfrienddrawcrossesandcirclesonasheetofpaper.Youdoitoneafteranother.Thefirstpupilwhogetsthreemarksinarowwins.Butdoyouknowthatyoucanplaythisgameanotherwayanditwillbecomemoreinteresting?Youmust...
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