bjr
800 = 2 x 400 = 2 x 2 x 200 = 2 x 2 x 2 x 100 = 2 x 2 x 2 x 2 x 50
= 2 x 2 x 2 x 2 x 2 x 25 = 2⁵ x 5²
et
650 = 2 x 325 = 2 x 5 x 65 = 2 x 5 x 5 x 13 = 2 x 5² x 13
donc
650/800 = 2 x 5² x 13 / 2⁵ x 5² = 13 / 2⁴ = 13/16
on vérifie
650/800 = 0,8125 (calculatrice)
et 13/16 = 0,8125
:)
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bjr
800 = 2 x 400 = 2 x 2 x 200 = 2 x 2 x 2 x 100 = 2 x 2 x 2 x 2 x 50
= 2 x 2 x 2 x 2 x 2 x 25 = 2⁵ x 5²
et
650 = 2 x 325 = 2 x 5 x 65 = 2 x 5 x 5 x 13 = 2 x 5² x 13
donc
650/800 = 2 x 5² x 13 / 2⁵ x 5² = 13 / 2⁴ = 13/16
on vérifie
650/800 = 0,8125 (calculatrice)
et 13/16 = 0,8125
:)