Question

9点到10点之间,什么时候时针和分针成一条直线

Answer 1

(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