bonjour
a ) 150 x 10³ x 8 x 10 ⁵ = 1 200 x 10⁸ = 1.2 x 10 ¹¹
b) 2 x 10 ³ x 5 x (10⁻⁵)² = 10 x 10³ x 10 ⁻¹⁰ = 10 x 10⁻⁷ = 10 ⁻⁶
c) 3 x 10⁸ x 4 x 10 ⁻⁵ = 12 x 10 ³ = 1.2 x 10 ⁴
d) 2 x 10 ⁹ x 7 x 10 ⁻⁶ = 14 x 10 ³ = 1.4 x 10 ⁴
e) 3 x 10² x 1.2 x 10 ⁻⁵ = 3.6 x 10 ⁻³
f) 5 x 10² x 0.3 x 10 ⁻⁶ = 1.5 x 10 ⁻⁴
