Réponse :
Bonsoir
Explications étape par étape
A = 1/5 X -4/3 +7/2
A = -4/15 +7/2
A = -4/15 X 2/2 +7/2 X 15/15
A = -8/30 + 105/30
A = 97/30
B = 4/5 : (-3/7) -7/10
B = 4/5 X 7/-3 -7/10
B = 28/-15 -7/10
B = -28/15 X 10/10 -7/10 X 15/15
B = -280/150 -105/150
B = -385/150 : 5/5 = -77/30
C = 13/7 + (-8/7) : (-4/5)
C = 13/7 -8/7 X 5/-4
C = 13/7 -40/-20
C = 13/7 X 20/20 +40/20 X 7/7
C = 260/140 + 280/140
C = 540/140 = 54/14 = 28/7
D = 7/3 +3/2 X -10/21
D = 7/3 -30/42
D = 7/3 X 14/14 -30/42
D = 98/42 -30/42
D = 68/42 = 34/21
E = 5/8 + (-3/4) : (-9/16)
E = 5/8 -3/4 X 16/-9
E = 5/8 -48/-36
E = 5/8 +48/36
E = 5/8 X 36/36 +48/36 X 8/8
E = 180/288 + 384/288
E = 564/288 :6/6 = 94/48 = 47/24
F = 6/5 - (-1/9) X (-3/4)
F = 6/5 +1/9 X -3/4
F = 6/5 -3/36
F = 6/5 X 36/36 -3/36 X 5/5
F = 216/180 -15/180
F = 201/180 : 3/3 = 67/60
