看不清,应该是减吧
订正(8/25)/(4/15)=24/75+20/75=44/75
(2/7)/(9/14)=4/14*14/9=36
(8/27)/(2/9)=8/27*27/6=8/6=4/3
(5/14)/(10/21)=15/42*42/20=15/20=3/4
(8/25)/(4/15)=24/75*75/20=24/20=6/5
(5/12)/(5/6)=5/12*12/10=5/10=1/2
(9/26)/(12/13)=9/26*26/24=9/24=3/8
(14/33 )/(7/11)=14/33*33/21=14/21=2/3
(15/19)/(5/38)=30/38*38/5=30/5=6