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∵時針在鐘面上每分鐘轉0.5°,分針每分鐘轉6°,∴鐘錶上下午2點30分時,時針與分針的夾角可以看成時針轉過2時0.5°×30=15°,分針在數位6上.∵鐘錶12個數位,每相鄰兩個數位之間的夾角為30°,∴下午2點30分時分針與時針的夾角4×30°-15°=105°.故答案為:105°.
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