Выполни действие:9/14+3/14,21/50+29/50,2+4/17,17+9/13

Вычислим значения выражений:

1) 9/14 + 3/14 = (9 * 1 + 3 * 1)/14 = (9 + 3)/14 = 12/14 = (2 * 6)/(2 * 7) = (1 * 6)/(1 * 7) = 6/7;

2) 21/50 + 29/50 = (21 * 1 + 29 * 1)/50 = (21 + 29)/50 = 50/50 = 1/1 = 1;

3) 2 + 4/17 = 34/17 + 4/17 = (34 + 4)/17 = 38/17 =  2 4/17;

4) 17 + 9/13= 17 9/13.