[几何] 异面直线所成的角

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游客 posted 2016-2-25 08:11 |Read mode

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weigang99888 posted 2016-2-25 17:23

应该选A，即$[0，\dfrac{1}{2}]$

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weigang99888 posted 2016-2-25 19:56

先确定点$P$的轨迹为圆，然后利用对称（巧解）。

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original poster 游客 posted 2016-2-26 10:17

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