bonsoir

a. 27 x 10 ³ = 27 000 = 2.7 * 10 ⁴

b . 390 * 10 ⁻⁷ =  0.000 039 = 3.9 * 10 ⁻⁵

c. 0.025 * 10 ⁷ = 250 000 = 2.5 * 10 ⁵

d. 0.88 * 10 ⁻⁵ = 0.000 008 8 = 8 .8 * 10 ⁻⁶

a. 1 800 * 10 ⁵ = 1.8 * 10 ³ * 10 ⁵ = 1.8 * 10 ⁸

b . 72 000 x 10 ⁻⁶ = 7.2 * 10 ⁻²

c.  0.072 * 10 ⁻⁵ = 7.2 * 10 ⁻⁷

d. 0.000 66 * 10 ⁻³ =  6.6 * 10 ⁻⁷

airbus = 5 .4 * 10 ⁵ kg

éléphant = 7 .5 * 10 ³

souris  =  2.9 * 10 ⁻² kg

grain de sable  = 3 * 10 ⁻⁹