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如图,⊙P与x轴切于点O,点P的坐标为(0,1),点A在⊙P上,且在第一象限,∠APO=120°.⊙P沿x轴正方向滚动,当点A第一次落在x轴上时,点A的横坐标为 (结果保留π).
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教案备课库《初三年级数学研修学案201431010》真题及答案
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