bonjour
a. 138 400 = 1.384 x 10 ⁵
b. 0.051 1 = 5.11 x 10 ⁻²
c . 9.85 = 9.85 x 10 ⁰
d. 0. 000 087 = 8.7 x 10 ⁻⁵
e. 3 x 10 ⁻⁵ x 40 x 10 ⁷ = 120 x 10 ² = 1.2 x 10 ⁴
f . 3 x 10 ⁷ + 98 x 10 ⁷ = 1.01 x 10 ⁹
g . 72 x 10 ⁷² / 4 x 10 ⁴ = 18 x 10 ⁶⁸ = 1.8 x 10 ⁶⁹
