(9*5-30)/(1-5/60)
=(45-30)/(1-1/12)
=15/(11/12)
=15*(12/11)
=180/11
=16又(4/11)分
(9*5)/(1-5/60)
=45/(1-1/12)
=45/(11/12)
=45*(12/11)
=540/11
=49又(1/11)分
9点到10点之间,9点16又(4/11)分和9点49又(1/11)分时候时针和分针成一条直线. 老师也这么说