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Sagot :

MAUDMARINE

Bonjour

A = 5/7 - (3/2 - 5/4)

A = 5/7 - [(3 x 2) / (2 x 2) - 5/4]

A = 5/7 - (6/4 - 5/4)

A = 5/7 - 1/4

A = (5 x 4) / (7 x 4) - (1 x 7) / (4 x 7)

A = 20/28 - 7/28

A = 13/28.

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