当时钟是1点45分时,分针和时针所成的钝角是_ 度.
问题描述:
当时钟是1点45分时,分针和时针所成的钝角是______ 度.
答
(360°÷60)×[20+(5÷60)×45],
=6°×[20+
×45],1 12
=6°×[20+3.75],
=6°×23.75,
=142.5°
答:分针和时针所成的钝角是142.5 度.
故答案为:142.5.