ответ: 5/6.
Пошаговое объяснение:
9/22-4/9:(3- 23/15)+8/11 = 5/6.
1) 3-1 8/15 = 2 15/15 - 1 8/15 = 1 (15-8)/15 = 1 7/15;
2) 4/9 : 1 7/15 = 4/9 : 22/15 = 4/9 * (15/22) = 10/33;
3) 9/22 - 10/33 = 27/66 - 20/66 = 7/66;
4) 7/66+8/11 = 7/66 + 48/66= 55/66=5/6.
