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分針旋轉一周,就過去了一個小時,對於時針來說,鐘面上有12小時,而周角是360°,所以那12個小時就要平均分周角,那麼過去一個小時,時針走:360°÷12=30°.那麼,分針旋轉3周,過去3個小時,時針就走過去一個小時所轉度數的3倍,即30°×3=90°. 即答案分別填:30,90
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