Bonjour, exercice 63, merci d'avance :-)

Exercice 63 :

[tex]C= \frac{49\times10^3\times6\times10^-^1^0}{14\times10^-^2} \\ \\ C= \frac{49\times6}{14} \times \frac{10^3^-^1^0}{10^-^2} \\ \\ C= \frac{294}{14} \times \frac{10^-^7}{10^-^2} \\ \\ C=21\times10^-^7^+^2 \\ \\ C=21\times10^-^5 \\ \\\boxed{ C=2,1\times10^-^4}[/tex]

C=49×6/14 × 10^(3-10-(-2))
=7×7×2×3/7×2 × 10^-5
=21×10^-5
=2,1×10^-4