-3
Пошаговое объяснение:
1) 3 8/9 * 3/7 = 35/9 * 3/7 = 5/3 = 1 2/3
2) 7 - 1 2/3 = 5 1/3
3) 5 1/3 : 3 1/9 = 16/3 : 28/9 = 16/3 * 9/28 = 24/14 = 1 5/7
4) 1 5/7 - 4 5/7 = -3
-3
Пошаговое объяснение:
1) 3 8/9 * 3/7 = 35/9 * 3/7 = 5/3 = 1 2/3
2) 7 - 1 2/3 = 5 1/3
3) 5 1/3 : 3 1/9 = 16/3 : 28/9 = 16/3 * 9/28 = 24/14 = 1 5/7
4) 1 5/7 - 4 5/7 = -3