Ответ:
Пошаговое объяснение:
первый пример
3/4 х 5/7 = 15/28
7/9 х 3/7 = 21/63=1/3
2 х 3/5 = 6/5 = 1 1/5
5/8 х 1 1/15=5/8 х 16/15 = 1 х 2/3 = 2/3
2 1/10 х 1 1/14 = 21/10 х 15/14 = 3/2 х 3/2 = 9/4 = 2 1/4
пятый пример
(5/22 + 2/11Х) х 44 = 16
5/22 + 4/22Х = 16/44=8/22
9/22Х = 8/22
Х = 8/22 - 9/22 = -1/22
шестой пример
(9 - 2 2/3 х 2 1/7) х 21/46
9 - (8/3 х 15/7) х 21/46
(9 - 5 5/7) х 21/46
3 2/7 х 21/46 = 15/7 х 21/46 = 45/46