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Meilleure réponse !
2014-10-08T17:00:15+02:00
Ici, ^ se lit puissance

Exercice 4
1. 1,045 x 10^-6 = ..
2. 4,08 x 10^5 = ..
3. 0,000 902 9 = 9,029 x 10^-4
4. 7,082 x 10^-4 = ..
5. 5,1 x 10^5 = ..
6. 1,06 x 10^3 = ..

Exercice 5

A = (0.4x10^5x8,1x10^5) / (36x(10^8)^3
A = (4 x10^-1 x 81x10^-1 x10^(5+5)) / (36 x 10^(8x3))
A = (4 x 81 x 10^(-1-1+10)) / (4x9 x 10^24)
A = (9x9 x 10^8 x 10^-24) /9
A = 9 x 10^(8-24)
A = 9 x 10^-16

B = (0.49 x 10^-1 x 2 800 x 10^2) / (11.2 x (10^-9)^4)
B = (0.49 x 2,8 x 10^3 x 10^(-1+2)) / (11.2 x 10^(-9x4))
B = (0.49 x 2,8 x 10^3 x 10^1) / (11.2 x 10^-36)
B = (4.9 x 2,8 x 10^3 x 10^36)  / 11.2
B = (13.72/11.2) x 10^(3+36)
B = 1.225 x 10^39