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 :