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Réponse :

Explications étape par étape

Bonjour

Effectuer les calculs :

A = 1 - 5/2 : 15/4

A = 1 - 5/2 x 4/15

A = 1 - 5/15 x 4/2

A = 1 - 1/3 x 2

A = 1 - 2/3

A = 3/3 - 2/3

A = 1/3

B = 9 x 3/2 - 10

B = 27/2 - 10

B = 27/2 - 20/2

B = 7/2

B = 3,5

C = 7/8 - 3/4 x 20/9

C = 7/8 - 20/4 x 3/9

C = 7/8 - 5 x 1/3

C = 7/8 - 5/3

C = 21/24 - 40/24

C = -19/24

D = 15/49 x 28/35

D = 15/35 x 28/49

D = (3 x 5)/(5 x 7) x (7 x 4)/(7 x 7)

D = 3/7 x 4/7

D = 12/49

E = 6/7 - 4/7 : 2/5

E = 6/7 - 4/7 x 5/2

E = 6/7 - 20/14

E = 12/14 - 20/14

E = -8/14

E = -4/7

F = (3 - 1/7)(2/5 + 4)

F = (21/7 - 1/7)(2/5 + 20/5)

F = 20/7 x 22/5

F = 22/7 x 20/5

F = 22/7 x 4

F = 88/7

G = (1/2 + 3/5)/(2 - 13/15)

G = (5/10 + 6/10)(30/15 - 13/15)

G = 11/10 + 17/15

G = 33/30 + 34/30

G = 67/30

H = 5/2 : 25

H = 5/2 x 1/25

H = 5/25 x 1/2

H = 1/5 x 1/2

H = 1/10