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Sagot :

Bonjour,

A=

5/7 -( 12/8 - 10/8)

= 5/7 - 2/8

=40/56 - 14/56

= 26/56 = 13/28

B=

5/8 -7/4 = 5/8 - 14/8 = - 9/8

-1/3 -4/3 = - 5/3

->  ( -9/8) - (-5/3)

=  -9/8 + 5/3

= -27/24 + 40/24

= 13/24

Réponse :

A= 5/7 - ( 3x2/2x2 - 5/4)

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

A= 5/7 - 1/4

A= 5x4/7x4 - 1x7/4x7

A= 20/28 - 7/28

A= 13/28

Explications étape par étape :

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