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Meilleure réponse !
2013-10-20T01:29:34+02:00
Exercice AB.5
B = (3*10^5*2*10^-2)/(8*10^4)
B = (3*2*10^3*10^-4)/(2*4)
B = (3/4)*10^-1
B = 0.75*10^-1
B = 0.075 (écriture décimale)
B = 7.5 *10^-2 (écriture scientifique)

Exercice AB.6
A = (1.5*10^7*4*10^-5)/(25^10^2)
A = (1.5*4/25)*10^2*10^-2
A = 0.24*10^0 or 10^0=1
A = 0.24

Exercice AB.7
B = (5*10^-3*12*10^4)(3*10^5) or 12=3*4
B = (5*3*4/3)*10^1*10^-5
B = 20*10^-4 or 20=2*10^1
B = 2*10^-3

Exercice AB.8
A= 3*10^-4*7*10^6*1.25
A = 3*7*1.25*10^(-4+6)
A = 26.25*10^2
A = 2625

Exercice AB.9
C = 7.5*10^9*2*10^-14
c = 7.5*2*10^(9-14)
C = 15*10^5 or 15=1.5*10^1
C = 1.5*10^1*10^-5
C = 1.5*10^(1-5)
C = 1.5*10^-4

Exercice AB.10
D=0.000 000 000 037
D = 3.7 * 10^-11
E = 58 300 000 000
E = 5.83 * 10^10
F = 6.2*10^25*5*10^-14
F = 6.2*5*10^(25-14)
F = 31*10^11
F = 3.1*10^12

Exercice AB.11
C = 153*10^-4 + 32*10^-3 -16*10^-5
C = 0.0153 + 0.032 - 0.00016
C = 0,04714
C = 4.714 * 10^-2

Exercice AB.12
C = (7*10^-12*4*10^5)/(2*10^-4)
C = 7*2*2/2 * 10^-7*10^4
C = 14*10^-3