а)11/35и7/45
11/35*9=99/315
7/45*7=49/315
б)7/10и5/14
7/10*7=49/70
5/14*5=25/70
в)3/20и1/16
3/20*4=12/80
1/16*5=5/80
г)2/15и4/27
2/15*9=18/135
4/27*5=20/135
д)5/42и3/56
5/42*4=20/168
3/56*3=9/168
е)29/60и109/126
29/60*21=609/1260
109/126*10=1090/1260
ё)139/270и109/126
139/270*7=973/1890
109/126*15=1635/1890
ж)139/270и71/450
139/270*5=695/1350
71/450*3=213/1350
з)17/104и59/338
17/104*13=221/1352
59/338*4=236/1352