1) 2 1/6 : 1 2/3 = 13/6 : 5/3 = 13/6 : 10/6 = 13/6 * 6/10 = 1 3/10
2) 8 1/7 * 2 4/19 = 57/7 * 42/19 = 18
3) 1 3/10 - 18 + 8 4/5 = 13/10 - 180/10 + 88/10 = - 79/10 = - 7,9
ответ: - 7,9
1) 2 1/6 : 1 2/3 = 13/6 : 5/3 = 13/6 : 10/6 = 13/6 * 6/10 = 1 3/10
2) 8 1/7 * 2 4/19 = 57/7 * 42/19 = 18
3) 1 3/10 - 18 + 8 4/5 = 13/10 - 180/10 + 88/10 = - 79/10 = - 7,9
ответ: - 7,9