Sagot :
[tex]20800 \ m/s = 20800 \times 3,6 \ km/h = 74880 \ km/h = 7,488.10^{4} \ km/h[/tex]
[tex]20 \ 800 m.s^-^1 \\ = 20 \ 800 \times 3.6 \ km.h^-^1
\\ = 74 \ 880 \ km.h^-^1[/tex]
74 880 km.h⁻¹ = 7,488 x 10⁴ km.h⁻¹
74 880 km.h⁻¹ = 7,488 x 10⁴ km.h⁻¹