高二數學向量問題:－線上遊戲排行榜2013/2014,進擊的巨人線上看,candy crush saga外掛,正妹寫真三圍

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高二數學向量問題

Mar 2nd 2014, 02:05

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設向量u=(-2,1,1), 向量v=(5,-5,2) 向量w=2向量u+k向量v, k為實數, 若w 平分u和v的夾角, 則k=? (提示菱形的對角線平分其頂角) 算出來答案2/3 但為何負的不行?...

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