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Sagot :

Bonjour

A = 4/7 + 2/7 + 1/7 + 3/4 + 5/4

A = 7/7 + 8/4

A = 1 + 8/4

A = 4/4 + 8/4

A = 12/4

A = 3

B = 5/12 + 23/12 - 5/3 - 2/3

B = 28/12 - 7/12

B = 21/12

B = 7/4.

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