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高中斜接數學 很多題目請耐心解答 20點囉
Aug 19th 2013, 11:03

設a,b,c 均為實數 試證 : 1. (a+b)^2大於等於4ab
2. a^2+b^2+c^2大於等於1/3(a+b+c)^2大於等於ab+bc+ca

在座標平面上,有兩點A(2,1) B(-3,2)
試在x軸上找一點C,使AC線段+BC線段最小, 並求極小值和C點座標

在三角形ABC中,角A的分角線交BC線段於D,若AB=3,BC=5 ,CA=4
求三角形ABD的面積

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