Пошаговое объяснение:
1) 1 7/21
2)-1 2/8
3)-3 30/30 = -4
4)-4/28
Пошаговое объяснение:
1) -3/14 - 8/21 = -6/42 - 16/42 = - 22/42
-22/42 * 21/20= -11/20
2) - 3/8 * 8/5 = - 3/5
- 9/4 * 11/15 = - 33/ 20
-3/5 + 33/20 = 21/20
3) -49/12 + 39/10= -245/60 + 234/60 = -11/60
-11/60 * 10/33= - 1/18
4) 11/14 - 5/6 = 33/42 - 35/42 = -2/42 = -1/21
11/14 - 3/4 = 22/28 -21/28= 1/28
-1/21 * 28/1 = -4/3
