Решить пример:

(2/3+1/5+13/18+4/+5+5/18+1/3) : 2

1) 2/3 + 1/5 + 13/18 + 4/5 + 5/18 + 1/3

НОК (3,5,18,5,18,3) = 90

90:3 = 30 90:5 = 18 90:18 = 5 90:5 = 18 90:18 = 5 90:3 = 30

(2 * 30 + 1 * 18 + 13 * 5 + 4 * 18 + 5 * 5 + 1 * 30) / 90 = (60 + 18 + 65 + 72 + 25 + 30) / 90 = 270/90 = 3

2) 3:2=3 * 1/2 = 3/2 = 1 1/2

1 1/2 = 1,5

ответ 1 1/2 = 1,5