8/14 = 7/63 = 30/84 = 34*12/3*17 = 9/20+1/15=

Найдем значения выражений:

1) 8/14 = (2 * 4) / (2 * 7) = (1 * 4) / (1 * 7) = 4/7;

2) 7/63 = 7 / (7 * 9) = 1 / (1 * 9) = 1/9;

3) 30/84 = (15 * 2) / (2 * 42) = (15 * 1) / (1 * 42) = 15/42 = (5 * 3) / (14 * 3) = (5 * 1) / (14 * 1) = 5/14;

4) (34 * 12) / (3 * 17) = (17 * 2 * 4 * 3) / (3 * 17) = (1 * 2 * 4 * 1) / (1 * 1) = 2 * 4 = 8;

5) 9/20 + 1/15 = (9 * 3 + 1 * 4) / 60 = (27 + 4) / 60 = 31/60.