Bonsoir
Exercice 16
A = 3/7 + 2/7
= (3 + 2) / 7
= 5/7
B = -5/3 + 7/3
= (-5 + 7) / 3
= 2/3
C = 4/5.3 + (-7)/5.3
= (4 + (-7)) / 5.3
= (4 - 7) / 5.3
= (-3)/5.3
D = (-4)/8 + (-7)/8
= (-4 + (-7)) / 8
= (-4 - 7) / 8
= (-11)/8
Exercice 17
A = 6/4 - 11/4
= (6 - 11) / 4
= (-5)/4
B = 3/11 - 7/11
= (3 - 7) / 11
= (-4)/11
C = 2/9 - (-5)/9
= (2 - (-5)) / 9
= (2 + 5) / 9
= 7/9
D = -11/7 - (-5)/7
= (-11 - (-5)) / 7
= (-11 + 5) / 7
= (-6)/7
Voilà j'espère avoir pu t'aider ^^
