Réponse :
A = (4,9 X 10^3 X 10^2) / (7 X 10^-9)
= (4,9 / 7) X (10^3 X 10^2) / 10^-9
= 0,7 X 10^(3 + 2 - (-9)) (Parce 10^a X 10^b = 10^(a + b) et
= 0,7 X 10^(5 + 9) 10^a / 10^b = 10^(a - b) )
= 0,7 X 10^14
= 7 X 10^13
__________
B = (36 X 10^-4 X (10^2)^-3) / 3 X 10^6
= 36/3 X (10^-4 X (10^2)^-3) / 10^6
= 12 X (10^-4 X 10^-6) / 10^6 (Parce (10^a)^b = 10^ab)
= 12 X 10^(-4 - 6 - 6)
= 12 X 10^-16
= 1,2 X 10^-15
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Réponse :
A = (4,9 X 10^3 X 10^2) / (7 X 10^-9)
= (4,9 / 7) X (10^3 X 10^2) / 10^-9
= 0,7 X 10^(3 + 2 - (-9)) (Parce 10^a X 10^b = 10^(a + b) et
= 0,7 X 10^(5 + 9) 10^a / 10^b = 10^(a - b) )
= 0,7 X 10^14
= 7 X 10^13
__________
B = (36 X 10^-4 X (10^2)^-3) / 3 X 10^6
= 36/3 X (10^-4 X (10^2)^-3) / 10^6
= 12 X (10^-4 X 10^-6) / 10^6 (Parce (10^a)^b = 10^ab)
= 12 X 10^(-4 - 6 - 6)
= 12 X 10^-16
= 1,2 X 10^-15