1)Найдите значение выражений 6 1/8-3 1/2= 10 1/24-1 3/4= (2 4/9+3

1)
а) 6 1/8 - 3 1/2 = 49/8 - 7/2 = (49 - 28)/8 = 21/8 = 2 5/8.
    6 1/8 = (6 * 8 + 1)/8 = 49/8.
    3 1/2 = (3 * 2 + 1)/2 = 7/2.
б) 10 1/24 - 1 3/4 = 241/24 - 7/4 = (241 - 42)/24 = 199/24 = 8 7/24.
    10 1/24 = (10 * 24 + 1)/24 = 241/24.
    1 3/4 = (1 * 4 + 3)/4 = 7/4.
в) (2 4/9 + 3 8/11) + (1 5/9 + 3 3/11) = 11.
    2 4/9 = (2 * 9 + 4)/9 = 22/9.
    3 8/11 = (3 * 11 + 8)/11 = 41/11.
    1 5/9 = (1 * 9 + 5)/9 = 14/9.
    3 3/11 = (3 * 11 + 3)/11 = 36/11.
 1. 22/9 + 41/11 = (242 + 369)/99 = 611/99.
 2. 14/9 + 36/11 = (154 + 324)/99 = 478/99.
 3. 611/99 + 478/99 = 1089/99 = 11.

2) x + 6 7/9 = 13.
    6 7/9 = (6 * 9 + 7)/9 = 61/9.
    13 = 12 9/9 = (12 * 9 + 9)/9 = 117/9.
    х = 13 - 61/9 = 117/9 - 61/9 = 56/9 = 6 2/9.

3) Задачка:
 1. 7 3/7 - 5 3/4 = 52/7 - 23/4 = (208 - 161)/28 = 47/28 = 1 19/28 тонн.
    7 3/7 = (7 * 7 + 3)/7 = 52/7.
    5 3/4 = (5 * 4 + 3)/4 = 23/4.
Ответ: 1 19/28 тонн картофеля осталось.