Вычтслите произвкдение 13/10*100/39; 7/8*4/35*10/9; 42/56*16/5*15/36; 6/7*5/6; 13/15*45/26; 5/7*7/13*13/18; 101/102*102/103*103/104; 6/7*7/6.

13/10*100/39 = 10/3
7/8*4/35*10/9 = 1/9
42/56*16/5*15/36 = 1
6/7*5/6 = 5/7
13/15*45/26 = 3/2
5/7*7/13*13/18 = 5/18
101/102*102/103*103/104 = 101/104
6/7*7/6. = 1