Réponse :
D = 10^5 x (10^-3)^4
D = 10^5 x 10^-3x4
D = 10^5 x 10^-12
D = 10^5+(-12)
D = 10^5-12
D = 10^-7
E = 10 x (10^-7)^3 x 10^9
E = 10 x 10^-7x3 x 10^9
E = 10 x 10^-21 x 10^9
E = 10^1+(-21)+9
E = 10^1-21+9
E = 10^-11
F = 2^3 x 5^3 x 10^8
F = (2 x 5)^3 x 10^8
F = 10^3 x 10^8
F = 10^3+8
F = 10^11
G = 10^-2 x 10^-7 / 10^6
G = 10^-2+(-7) / 10^6
G = 10^-2-7 / 10^6
G = 10^-9 / 10^6
G = 10^-9-6
G = 10^-15