Bonjour
[tex] = \frac{60 \times 10 {}^{15} }{3 \times 10 {}^{8} } = \frac{60}{3} \times \frac{10 {}^{15} }{ {10}^{8} } = 20 \times 10 {}^{7} = 2 \times 10 {}^{8} [/tex]
[tex] = \frac{45 \times 10 {}^{ - 2} }{10 {}^{2} } = 45 \times 10 {}^{ - 4} = 4.5 \times 10 {}^{ - 3} [/tex]
bonne journée
