Réponse :
bonsoir
Explications étape par étape :
A = 3/2 + 4/5
A = (3 x 5)/ (2 x 5) + (4 x 2) / (5 x 2)
A = 15/10 + 8/10
A = 23/10
B = 13/15 - 3/5
B = 13/15 - ( 3 x 3)/ (3 x 5)
B = 13/15 - 9/15
B = 4/15
C = 35/4 x -28/5
C = (35 x -28)/(4 x 5)
C = 35/5 x -28/4
C = 7 x -7
C = - 49
D = 7/10 x 3/5
D = (7 x 3)/( 10 x 5)
D = 21/50
E = (12/7 + 8/7) x 4/5
E = 20/7 x 4/5
E = 80/35
E = 16/7
F = 5/8 x ( 3/4 + 7/4)
F = 5/8 x 10/4
F = 50/32
F = 25/16
G = 7 x ( 3 + 5/7)
G = 7 x ( 3 x 7 + 5)/7
G = 7 x (21 + 5)/7
G = 7 x 26/7
G = 26
H = (1/2 + 3/4) x 2/3
H = ((1 x 2)/(2 x 2) + 3/4) x 2/3
H = (2 + 3)4 x 2/3
H = 5/4 x 2/3
H = 10/12
H = 5/6
I = (12/7 + 8/7) x (7/5 - 1/5)
I = 20/7 x 6/5
I = 120/35
I = 24/7
J = 1 - ( 1/6 + 5/12)
J = 1 - ( 2 x 1 + 5)12
J = 1 - 7/12
J = (12 - 7)/12
J = 5/12
K = 2/3 x 7/5 - 4/15
K = 14/15 - 4/15
K = 10/15
K = 2/3
L = 3/4 x 4/5 + 7/2
L = 12/20 + 7/2
L = 3/5 + 7/2
L = (3 x 2 + 7 x 5)/ ( 5 x 2)
L = (6 + 35)/10
L = 41/10
M = 1/2 + 5/2 x 7/10
M = 1/2 + 35/20
M = (10 + 35)/20
M = 45/20
M = 9/4
N = 4/7 + 15/7 x 5/2
N = 4/7 + 75/14
N = (4 x 2)/( 7 x 2) + 75/14
N = (8 + 75)/14
N = 83/14
O = 1 - 5/2 x 4/15
O = 1 - 20/30
O = 1 - 2/3
O = (3 - 2)/3
O = 1/3
P = 2/7 + 5/14 x ( 2/3 + 1/3)
P = 2/7 + 5/14 x 1
P = (4 + 5)/14
P = 9/14
voilà
bonne soirée
