0 < 3A - 5 < 13
5 < 3A < 18
1 2/3 < A < 6
3А - 5 ≠ 0
3А ≠ 5
А ≠ 1 2/3
<span>Ответ A = 2 ; A = 3 ; A = 4 ; A = 5 </span>
4/5 х 5\6 х 6/7 х 7/8= 1/2
1) 4/5 х 5/6 = 2/3
2) 2/3 х 6/7 = 4/7
3) 4/7 х 7/8 = 1/2
6/29 * (6 -24/11 * 14/9) = 6/29 * (6 - 112/33) = 6/29 * (198/33 - 112/33) = 6/29 * 86/33 = 172/319