Найдите значение выражения : 3 2/5 - (1 1/3+ 1 1+4) б) 3,4 + 2 3/4 Выполните действия ( 3 1/4-2 2/3 )+(1 5/6- 7/12)+3

№1 а) 3 2/5 - (1 1/3 + 1 1/4) = 17/5 - (4/3 + 5/4) = 17/5 - (4 * 4 + 5 * 3)/12 = 17/5 - (16 + 15)/21 = 17/5 - 31/21 = (17 * 21 - 31 * 5)/105 = (357 - 155)/105 = 202/105 = 1 97/105;

б) 3,4 + 2 3/4 = 3 4/10 + 2 3/4 = 3 2/5 + 2 3/4 = 17/5 + 11/4 = (17 * 4 + 11 * 5)/20 = (68 + 55)/20 = 123/20 = 6 3/20.

№2

(3 1/4 - 2 2/3) + (1 5/6 - 7/12) + 3 5/24 = (13/4 - 8/3) + (11/6 - 7/12) + 77/24 = (13 * 3 - 8 * 4)/12 + (11 * 2 - 7 * 1)/12 + 77/24 = (39 - 32)/12 + (22 - 7)/12 + 77/24 = 7/12 + 15/12 + 77/24 = (7 * 2 + 15 * 2 + 77)/24 = (14 + 30 + 77)/24 = 121/24 = 5 1/24.