7/18 90/77 = (790)/(18*77) = 630/1386 = 105/231
63/64 48/91 = (6348)/(64*91) = 3024/5824 = 126/242
19/100 5/38 = (195)/(100*38) = 95/380 = 19/76
Итак, произведения равны: 105/231, 126/242 и 19/76.
7/18 90/77 = (790)/(18*77) = 630/1386 = 105/231
63/64 48/91 = (6348)/(64*91) = 3024/5824 = 126/242
19/100 5/38 = (195)/(100*38) = 95/380 = 19/76
Итак, произведения равны: 105/231, 126/242 и 19/76.