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