Найдите произведение:1)6/11*4/72)7/20*10/21
3)8/9*27/32
4)23/28*49/46
5)34/86*43/51
6)7/18*90/77
7)63/64*48/91
8)19/100*5/38

черточки это дроби :)

6/11 * 4/7 = (6*4)/(11*7) = 24/77
7/20 * 10/21 = (7*10) /(20*21) = (1*1) / (2*3) =1/6
8/9 * 27/32 = (8*27)/(9*32) = (1*3 ) / (1*4) = 3/4
23/28 * 49/46 = (23*49) /(28*46) = (1*7)/(4*2) =7/8
34/86 * 43/51 = (34*1)/(2*51) = (17*1)/(1*51) = (1*1)/(1*3)= 1/3
7/18 * 90/77 = (7*90)/(18*77) = (1*10)/(2*11) = (1*5)/(1*11)=5/11
63/64 * 48/91 = (63*48)/(64*91) = (9*6)/(8*13) = (9*3)/(4*13) =27/52
19/100 * 5/38 = (19*5) /(100*38) = (1*1)/(20*2)= 1/40