Réponse :
Explications étape par étape
Bonsoir
Exercice 34 :
Calculer :
A = -1/4 + 11/4
A = (-1 + 11)/4
A = 11/4
B = 2/3 + 5/6
B = (2 x 2)/(3 x 2) + 5/6
B = 4/6 + 5/6
B = (4 + 5)/6
B = 9/6
B = (3 x 3)/(2 x 3)
B = 3/2
C = 3/4 - 5/6
C = (3 x 3)/(4 x 3) - (5 x 2)/(6 x 2)
C = 9/12 - 10/12
C = (9 - 10)/12
C = (-1/12)
D = 4/7 - 3/4
D = (4 x 4)/(7 x 4) - (3 x 7)/(4 x 7)
D = 16/28 - 21/28
D = (16 - 21)/28
D = (-5)/28
Exercice 35 :
Calculer :
A = 5/6 + 5/12
A = (5 x 2)/(6 x 2) + 5/12
A = 10/12 + 5/12
A = (10 + 5)/12
A = 15/12
A = (5 x 3)/(4 x 3)
A = 5/4
B = -8/5 - 1/15
B = (-8 x 3)/(5 x 3) - 1/15
B = -24/15 - 1/15
B = (-24 - 1)/15
B = (-25)/15
B = (-5 x 5)/(5 x 3)
B = -5/3
C = 1/6 - 1/5
C = (1 x 5)/(6 x 5) - (1 x 6)/(5 x 6)
C = 5/30 - 6/30
C = (5 - 6)/30
C = (-1/30)
D = -5/7 + 3/2
D = (-5 x 2)/(7 x 2) + (3 x 7)/(2 x 7)
D = -10/14 + 21/14
D = (-10 + 21)/14
D = 11/14
