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悠闲数学娱乐论坛(第3版)
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异面直线所成的角
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异面直线所成的角
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Post time 2016-2-25 08:11
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Post time 2016-2-25 17:23
应该选A，即$[0，\dfrac{1}{2}]$
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Post time 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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Post time 2016-2-26 10:17
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悠闲数学娱乐论坛(第3版)
2025-3-6 22:10 GMT+8
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weigang99888
Post time 2016-2-25 17:23
weigang99888
Post time 2016-2-25 19:56
