A= (3/4-11/8):(5/3-7/4) A = (3 x 2 / 4 x 2 - 11/8) : (5 x 4 / 3 x 4 - 7 x 3 / 4 x 3) A = (6/8 - 11/8) : (20/12 - 21/12) A = - 5/8 : - 1/12 A = - 5/8 x - 12/1 A = 60/8 A = 4 x 15 / 4 x 2 A = 15/2
C=2/3-(-4/9+7/6) C = 2/3 - (- 4 x 2 / 9 x 2 + 7 x 3 / 6 x 3) C = 2/3 - (- 8/18 + 21/18) C = 2 x 6 / 3 x 6 - (13/18) C = 12/18 - 13/18 C = - 1/18
D=(8/7-6/5)*7/4-2 D = (8 x 5 / 7 x 5 - 6 x 7 / 5 x 7) x 7/4 - 2 D = (40/35 - 42/35) x 7/4 - 2 D = - 2/35 x 7/4 - 2 D = - 14/140 - 2 D = 14 x - 1 / 14 x 10 - 2 x 10 / 1 x 10 D = - 1/10 - 20/10 D = - 21/10
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Bonjour,A= (3/4-11/8):(5/3-7/4)
A = (3 x 2 / 4 x 2 - 11/8) : (5 x 4 / 3 x 4 - 7 x 3 / 4 x 3)
A = (6/8 - 11/8) : (20/12 - 21/12)
A = - 5/8 : - 1/12
A = - 5/8 x - 12/1
A = 60/8
A = 4 x 15 / 4 x 2
A = 15/2
C=2/3-(-4/9+7/6)
C = 2/3 - (- 4 x 2 / 9 x 2 + 7 x 3 / 6 x 3)
C = 2/3 - (- 8/18 + 21/18)
C = 2 x 6 / 3 x 6 - (13/18)
C = 12/18 - 13/18
C = - 1/18
D=(8/7-6/5)*7/4-2
D = (8 x 5 / 7 x 5 - 6 x 7 / 5 x 7) x 7/4 - 2
D = (40/35 - 42/35) x 7/4 - 2
D = - 2/35 x 7/4 - 2
D = - 14/140 - 2
D = 14 x - 1 / 14 x 10 - 2 x 10 / 1 x 10
D = - 1/10 - 20/10
D = - 21/10
Voilà la réponse
Exercice 1 : Calculer chaque expressions et donner le résultat sous la forme d'une fraction la plus simple possible
a) (3/4 - 11/8) : (5/3 - 7/4)
a) (6/8 - 11/8) : (20/12 - 21/12)
a) -5/8 : -1/12
a) -5/8 x -12/1
a) 60/8 = 15/2
c) 2/3 - (-4/9 + 7/6)
c) 2/3 - (-24/54 + 63/54)
c) 2/3 - 39/54
c) 36/54 - 39/54
c) -3/54 = -1/18
d) (8/7 - 6/5) x 7/4 - 2/1
d) (40/35 - 42/35) x 7/4 - 2/1
d) -2/35 x 7/4 - 2/1
d) -14/140 - 280/140
d) -294/140 = -21/10