bonsoir,
a) 49 000 000 = 4.9 x 10 ⁷
b) 320 x 0.001 = 0.32 = 3.2 x 10 ⁻¹
c) 1 400 x 10 ⁹ = 1.4 x 10 ³ x 10 ⁹ = 1.4 x 10 ¹²
d) 0.08 x 10 ⁻⁵ = 8 x 10 ⁻² x 10 ⁻⁵ = 8 x 10 ⁻⁷
e) 57 x 100 000 = 5.7 x 10 ⁵ = 5.7 x 10 ⁶
f) 5 x 10 ⁻⁹
A = 0.000 28 x 10 ⁻³ = 2.8 x 10 ⁻⁴ x 10 ⁻³ = 2.8 x 10 ⁻⁷
B = 1 789 x 10 ⁻² = 1.789 x 10 ³ x 10 ⁻² = 1.789 x 10
C = 10 235 x 10 ⁹ = 1.0235 x 10 ⁴ x 10 ⁹ = 1.0235 x 10 ¹³
D = 0.57 x 10⁴ = 5.7 x 10 ⁻¹ x 10 ⁴ = 5.7 x 10 ³
E = 756 x 10⁴ = 7.56 x 10 ² x 10 ⁴ = 7.56 x 10 ⁶
F = 54.3 x 10 ⁻³ = 5.43 x 10 x 10 ⁻³ = 5.43 x 10 ⁻²
