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Sagot :

VINS

bonjour

vitesse de la lumière = 300 000 km /s

300 000 x 3 600 x 24 x 365

= 3 x 10 ⁵ x 3.6 x 10 ³ x 24 x 365

= 94 608 x 10 ⁸

= 9 .4608 x 10 ¹² km

= 9.4608 x 10 ¹⁵  m

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