Réponse :
A = 2^4 X 2^8
= 2 ^ (4 + 8) (a^n X a^m = a^(m + n))
= 2^12
______
B = (-3)^5 X (-3)
= (-3)^5 X (-3)^1 (a = a^1)
= (-3)^(5 + 1)
= (-3)^6
______
C = 7^9 X (-7)^5
= 7^9 X ( - (7)^5) ((-a)^n = - (a ^ n) où, n est impair)
= 7^9 X 7^5 X (-1) (-n = -1 X n)
= 7^(9+5) X -1
= 7^14 X -1
= - (7^14)
_______
D = 5^4 / 5^3
= 5^(4 - 3) (a^n / a^m = a^(n - m))
= 5^1
_______
E = (-7)^9 / (-7)^12
= (-7) ^ (9 - 12)
= (-7) ^ (-3)
_______
F = 8^6 / 8
= 8^6 / 8^1
= 8^(6 - 1)
= 8^5
_______
G = (5^3)^6
= 5^(3 X 6) ( (a^n)^m = a^ (n X m) )
= 5^18
_______
H = ((-7)^2)^5
= (-7) (2 X 5)
= (-7) ^ 10
_______
I = ((2/3)^4)^5
= (2/3) ^ (4 X 5)
= (2/3)^20
Phew!
