(7*5-30*60/360)/(1-5/60)
=(35-5)/(1-1/12)
=30/(11/12)
=30*(12/11)
=360/11
=32又(8/11)分
(7*5+30*60/360)/(1-5/60)
=(35+5)/(1-1/12)
=40/(11/12)
=40*(12/11)
=480/11
=43又(7/11)分
在7点和8点之间,在7点32又(8/11)分和43又(7/11)分时,分针与时针成30°.
(7*5-180*60/360)/(1-5/60)
=(35-30)/(1-1/12)
=5/(11/12)
=5*(12/11)
=60/11
=5又(5/11)分
在7点和8点之间,在7点5又(5/11)分时,分针与时针成一条直线.
(7*5)/(1-5/60)
=35/(1-1/12)
=35/(11/12)
=35*(12/11)
=420/11
=38又(2/11)分
在7点和8点之间,在7点38又(2/11)分时,分针与时针重合.