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我們知道,分針轉360°,時針轉30°,即分針轉1°,時針轉1/12°,也就是說分針轉1°,可以追上時針11/12°,在四點的時候,時針領先分針120°,則分針轉120/(11/12)=1440/11°之後,正好追上時針,此時兩者重合,角度為1440/11=130.9°
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