摘要：解:(1)P6．··················································································· 2分 (2)······································································ 4分 (3)由题意知.旋转次之后回到轴正半轴.在这次中.点分别落在坐标象限的平分线上或轴或轴上.但各点绝对坐标的横.纵坐标均为非负数.因此.点的坐标可分三类情况: 令旋转次数为 ①当或时(其中为自然数).或当点落在轴上. 此时.点的绝对坐标为,········································································· 6分 ②当或或或时(其中为自然数).或当点落在各象限的平分线上. 此时.点的绝对坐标为···························································· 8分 ③当或时(其中为自然数).或当点落在轴上. 此时.点的绝对坐标为．······································································· 10分

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