Сделайте деянья. А) (15 5/6 - 9 25/27) -(2/3 5/18) +

А) (15 5/6 - 9 25/27) - (2/3 - 5/18) + 7/27 + 13/8 = 7 29/72.
    15 5/6 = (15 * 6 + 5)/6 = 95/6.
    9 25/27 = (9 * 27 + 25)/27 = 268/27.
 1. 95/6 - 268/27 = 855/54 - 536/54 = 319/54.
 2. 2/3 - 5/18 = 12/18 - 5/18 = 7/18.
 3. 319/54 - 7/18 = 319/54 - 21/54 = 298/54 на 2 = 149/27.
 4. 149/27 + 7/27 = 156/27 на 3 = 52/9.
 5. 52/9 + 13/8 = 416/72 + 117/72 = 533/72 = 7 29/72.
Б) ( 20 8/15 * 7 1/2 - 54 3/5 + 2/5) / (3 13/21 * 8 2/5 - 29 2/5) - 5/6 * 1 1/5 + 21/25 = 98 21/25.
    20 8/15 = (20 * 15 + 8)/15 = 308/15.
    7 1/2 = (7 * 2 + 1)/2 = 15/2.
    54 3/5 = (54 * 5 + 3)/5 = 273/5.
    3 13/21 = (3 * 21 + 13)/21 = 76/21.
    8 2/5 = (8 * 5 + 2)/5 = 42/5.
    29 2/5 = (29 * 5 + 2)/5 = 147/5.
    1 1/5 = (1 * 5 + 1)/5 = 6/5.
 1. 308/15 * 15/2 = (308 * 15)/(15 * 2) = 4620/30 = 154.
 2. 273/5 + 2/5 = 275/5 = 55.
 3. 154 - 55 = 99.
 4. 76/21 * 42/5 = (76 * 42)/(21 * 5) = 3192/105 на 21 = 152/5.
 5. 152/5 - 147/5 = 5/5 = 1.
 6. 5/6 * 6/5 = (5 * 6)/(6 * 5) = 30/30 = 1.
 7. 99 / 1 = 99.
 8. 99 - 1 = 98.
 9. 98 + 21/25 = 98 21/25.