Vă rog repede!!!!!

Răspuns:
Explicație pas cu pas:
a)
exponentul va fi 6 + 7 - 8 = 5
(5/8)^5
b)
(8/7)^20 : (8/7)^10 = (8/7)^10
c)
[(11/9)^11]^3 : (11/9)^22 = (11/9)^33 : (11/9)^22 = (11/9)^11
d)
(1/5)^100 - (1/5)^100 = 0