Réponse :
Bonsoir
Explications étape par étape
2)
A)
10^-2 * 10^5 = 10^(-2+5) = 10^3
10^13 * 10^-7 = 10^(13+(-7))= 10^6
10^-2 * 10^-3 = 10^(-2+(-3))= 10^-5
B)
10^2 * 10^3 * 10^4 = 10^(2+3+4)=10^9
10^4 * 10^2 * 10^-12 = 10^(4+2+(-12)) = 10^-6
3)
A = (10^8 * 10^-5)/10^2
A = (10^(8+(-5))/10^2
A = 10^3/10^2
A = 10^(3-2)
A = 10^1 (=10)
B = 10^2/(10^9 * 10^-6)
B = 10^2/(10^(9+(-6))
B = 10^2/10^3
B = 10^(2-3)
B = 10^-1
