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Sagot :

Réponse :

bonjour

Explications étape par étape :

A=2/7 -3/7 x 14/9

= 2/7 - 2/3

= 6/21 - 14/21

= -8/21

B= -7/8 x(2/3-1)

= -7/8 x (2/3 -3/3)

= -7/8 x -1/3

=7/24

C= 4/5 x 1/4 + 2/5

=1/2 +2/5

= 3/5

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