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可以把它看成是追擊問題,時針每分鐘旋轉0.5度,分針每分鐘旋轉6度,4點整時,在順時針方向,時針在前,分針在後,兩針所夾的角的度數為120°,兩針重合時,分針旋轉的角度等於時針旋轉的角度加上原來兩針相差的角度.設4點X分…
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