Răspuns:
Explicație pas cu pas:
a = -3/7
b = 1/5
c = -3/2
a)
a - b + c = -3/7 - 1/5 - 3/2 = -30/70 - 14/70 - 105/70 = -149/70
2 8/11 = 30/11
-149/70*30/11 = -447/77
b)
a + b - c = -3/7 + 1/5 + 3/2 = -30/70 + 14/70 + 105/70 = 89/70
(89/70)^2 = 7921/7900
c)
10/3*89/70 = 89/21