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[几何] 向量一题寻找几何解法

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hongxian posted 2014-10-22 15:10 |Read mode
已知$O$是锐角$\triangle ABC$的外接圆心,$\angle A=60^\circ$,$\dfrac{\cos B}{\sin C}\cdot\vv{AB}+\dfrac{\cos C}{\sin B}\cdot\vv{AC}=2m\cdot\vv{AO}$,则$m$的值为_______________

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等待hxh posted 2014-10-24 13:34
三角形的五心这本书上有介绍!

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其妙 posted 2014-10-24 20:07
$m=\sin A=\sin60^0$?凭记忆……

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original poster hongxian posted 2014-10-27 10:00
回复 3# 其妙
好记性!

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