Bonjour vous pouvez m’aider svp

bonjour

4 500 x 10 ⁸ = 4.5 x 10 ³ x 10 ⁸ = 4.5 x 10 ¹¹

87 x 10 ⁻⁵ = 8.7 x 10 x 10 ⁻⁵ = 8.7 x 10 ⁻⁴

0.61 x 10 ² = 6.1 x 10 ⁻¹ x 10 ² = 6.1 x 10

0.08 x 10 ⁻⁹ = 8 x 10 ⁻² x 10 ⁻⁹ = 8 x 10 ⁻¹¹

0.0092 x 10 ⁻⁴ = 9.2 x 10 ⁻³ x 10 ⁻⁴ = 9.2 x 10 ⁻⁷