8.
c)
1/2 + 1/3 + 1/6 =
Numitor comun 6
3/6 + 2/6 + 1/6 =
6/6 =
1
(4/12)^2 =
16/144 =
1/9
1^2011 • 9 =
9
*1 la orice putere este tot 1.
d)
1/3 - 1/9 =
Numitor comun 9
3/9 - 1/9 =
2/9
(2/9)^2 = 4/81
(1/3)^3 = 1/27
4/81 + 1/27 =
Numitor comun 81
4/81 + 3/81 =
7/81
(1/3)^4 = 1/81
7/81 • 81 =
7
