Bonsoir
A = 15 x (10^)7^2 x 3 x 10^-9
= 15 x 3 x 10^7x2 x 10^-9
= 45 x 10^14 x 10^-9
= 45 x 10^14-9
= 45 x 10^5
= 4 500 000
= 4.5 x 10^1 x 10^5
= 4.5 x 10^1+5
= 4.5 x 10^6
B = (3 x 10^3 x 2 x 10^-1) / (12 x 10^-2)
= [(3 x 2)/12] x [(10^3 x 10^-1) / 10^-2]
= (6 / 12) x (10^3-1 / 10^-2)
= 0.5 x (10^2 / 10^-2)
= 0.5 x 10^2+2
= 0.5 x 10^4
= 5 000
= 5 x 10^-1 x 10^4
= 5 x 10^-1+4
= 5 x 10^3
C = (10^-8 x 42 x 10^12) / (7 x 10^5)
= (42 / 7) x [(10^-8 x 10^12) / 10^5]
= 6 x (10^-8+12 / 10^5)
= 6 x (10^4 / 10^5)
= 6 x 10^4-5
= 6 x 10^-1
= 0.6
= 6 x 10^-1
D = (4.5 x (10^-3)^5 x 13 x 10^-3) / (0.9 x (10^2)^-6)
= [(4.5 x 13) / 0.9] x [(10^-3x5 x 10^-3) / 10^2x(-6)]
= (58.5 / 0.9) x [(10^-15 x 10^-3) / 10^-12]
= 65 x (10^-15-3 / 10^-12)
= 65 x (10^-18 / 10^-12)
= 65 x 10^-18+12
= 65 x 10^-6
= 0.000065
= 6.5 x 10^1 x 10^-6
= 6.5 x 10^1-6
= 6.5 x 10^-5
E = 6 x 10^-4 + 9 x 10^-3
= 0.0006 + 0.009
= 0.0096
= 9.6 x 10^-3
F = (39 x 10^7 - 231 x 10^6) / (3 x 10^-5)
= (390 000 000 - 231 000 000) / 0.00003
= 159 000 000 / 0.00003
= (159 x 10^6) / (3 x 10^-5)
= (159 / 3) x (10^6 / 10^-5)
= 53 x 10^6+5
= 53 x 10^11
= 5 300 000 000 000
= 5.3 x 10^1 x 10^11
= 5.3 x 10^1+11
= 5.3 x 10^12
Voilà j'espère avoir pu t'aider ^^
