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请问谁会做这道题？谢谢！

2025-04-10 15:47:24

推荐回答（1个）

回答1：

P在弧CD上时，角APB=1/2角AOB=45°
P从D向O运动时，角APB不断增大
所以M意味着走到D的时间
从O到C运动距离为1，时间为1秒
从C到D运动距离为1/4圆的周长，即π/2，时间也为π/2
所以M-1 = π/2,
得到M的横坐标为π/2 + 1，选C

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