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Sagot :

Bonjour

(1-1/7):12/5

= [(1 x 17) / (1 x 17) - 1/7] : 12/5

= (17/17 - 1/17) : 12/5

= 16/17 x 5/12

= 80/204

= (4 x 20) / (4 x 51)

= 20/51.

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