4*5/25*6 = 20/150 = 2/15
2*3*4*5/4*5*6*7 = 120 / 840 = 1/7
9*13+2*9/54*13 = 117 + 18 / 702 = 135 / 702
8*13/39*2 = 104 / 78
6*7*8*9*10/7*9*11*12 = 30240/8316
27*15-7*27/9*15-9*11 = 216/36
3*38/19*7 = 114/133
3*16-8*3/27 = 24/27
24*2+6*24/7*60-5*60 = 192/120