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時針每分鐘走0.5°,分針每分鐘走6°,而4點整時,分針和時針的夾角為120° 設經過x分它們重合,則 6x-0.5x=120, 解得x=240/11 經過240/11分鐘,即分針旋轉了(240/11)×6=1440/11=130又10/11°時分針與時針重合
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