Bonjour, c'est un DM de maths niveau 4 ème aidez-moi svp C=1/4-2x7/2 D=1-2/3x(2/3-4/5) E=4/7-1/3:(-5/2+4/6) F= 27/5 : -(-8) G=(3/4-5/6)-7/2-(3/5-2)

C=1/4-2x7/2
C=1/4-14/2
C=1/4-7
c=-27/4
D=1-2/3x(2/3-4/5)
D = 1 - 2/3 x  (2 x 5 / 3 x 5 - 4 x 3 / 5 x 3)
D = 1 - 2/3 x (10/15 - 12/15)
D = 1 - 2/3 x - 2/15
D = 1 + 4/45
D = 1 x 45 / 1 x 45 + 4/45
D = 45/45 + 4/45=49/45

E=4/7-1/3:(-5/2+4/6)
E = 4/7 - 1/3 : (- 5 x 3 / 2 x 3 + 4/6)
E = 4/7 - 1/3 : (- 15/6 + 4/6)
E = 4/7 - 1/3 : (- 11/6)
E = 4/7 - 1/3 x - 6/11
E = 4/7 + 6/33
E = 4 x 33 / 7 x 33 + 6 x 7 / 33 x 7
E = 132/231 + 42/231
E = 174/231
E = 3 x 58 / 3 x 77


F= 27/5 : -(-8)
F = 27/5 : 8
F = 27/8 x 1/8
F = 27/64

G=(3/4-5/6)-7/2-(3/5-2)
G = (3 x 3 / 4 x 3 - 5 x 2 / 6 x 2) - 7/2 - (3/5 - 2 x 5 / 1 x 5)
G = (9/12 - 10/12) - 7/2 - (3/5 - 10/5)
G = - 1/12 - 7/2 - (- 7/5)
G = - 1/12 - 7/2 + 7/5
G = - 1 x 5 / 12 x 5 - 7 x 30 / 2 x 30 + 7 x 12 / 5 x 12
G = - 5/60 - 210/60 + 84/60
G = - 131/60

C=1/4-2x7/2
C = 1/4 - 14/2
C = 1/4 - 14 x 2 / 2 x 2
C = 1/4 - 28/4
C = - 27/4

D=1-2/3x(2/3-4/5)
D = 1 - 2/3 x  (2 x 5 / 3 x 5 - 4 x 3 / 5 x 3)
D = 1 - 2/3 x (10/15 - 12/15)
D = 1 - 2/3 x - 2/15
D = 1 + 4/45
D = 1 x 45 / 1 x 45 + 4/45
D = 45/45 + 4/45
D = 49/45

E=4/7-1/3:(-5/2+4/6)
E = 4/7 - 1/3 : (- 5 x 3 / 2 x 3 + 4/6)
E = 4/7 - 1/3 : (- 15/6 + 4/6)
E = 4/7 - 1/3 : (- 11/6)
E = 4/7 - 1/3 x - 6/11
E = 4/7 + 6/33
E = 4 x 33 / 7 x 33 + 6 x 7 / 33 x 7
E = 132/231 + 42/231
E = 174/231
E = 3 x 58 / 3 x 77
E = 58/77

F= 27/5 : -(-8)
F = 27/5 : 8
F = 27/8 x 1/8
F = 27/64

G=(3/4-5/6)-7/2-(3/5-2)
G = (3 x 3 / 4 x 3 - 5 x 2 / 6 x 2) - 7/2 - (3/5 - 2 x 5 / 1 x 5)
G = (9/12 - 10/12) - 7/2 - (3/5 - 10/5)
G = - 1/12 - 7/2 - (- 7/5)
G = - 1/12 - 7/2 + 7/5
G = - 1 x 5 / 12 x 5 - 7 x 30 / 2 x 30 + 7 x 12 / 5 x 12
G = - 5/60 - 210/60 + 84/60
G = - 131/60