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360÷12=30°
每個小時是30°,8點到9點四十是1又2/3個小時,30*(1又2/3)=50° 或者,每分鐘時針走0.5°,八點到九點四十是100分鐘.求得,0.5*100=50°
時針從三點順時針方向旋轉120°,是7點
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