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Sagot :

Réponse:

A=13/28

B=13/24

Explications étape par étape:

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

= 5/7 - 3/2 +5/4

=20/28 - 42/28 +35/28

= 13/28

B= (5/7 + -7/4) _ (-1/3 - 4/3)

= (5/8 + -14/8) - (-5/3)

= -9/8 + 5/3

= -27/24 + 40/24

= 13/24

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