作者whalelover (鲸鱼狂)
看板SENIORHIGH
标题Re: [请益] 一题成大数学考古题!!
时间Mon Mar 28 23:35:09 2011
令三段长x,y,1-x-y ｛(x,y)丨0<x,y<1且x+y<1｝
〔x+y>(1-x-y) 〔x+y>1/2
〔x+(1-x-y)>y => 〔y<1/2
〔y+(1-x-y)>x 〔x<1/2
画图 #
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