vous pouvez m’aider svp,aux deux exercices avec les détails des calculs Merci d’avance

Réponse :

Explications étape par étape

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A = 3/5 + 7/20

A = (3 x 4)/(4 x 5) + 7/20

A = 12/20 + 7/20

A = 19/20

B = -3/8 + 5/12

B = (-3 x 3)/(8 x 3) + (5 x 2)/(12 x 2)

B = -9/24 + 10/24

B = 1/24

C = 7/9 - 4/3

C = 7/9 - (4 x 3)/(3 x 3)

C = 7/9 - 12/9

C = -5/9

D = 11/6 - (-7/4)

D = (11 x 2)/(6 x 2) + (7 x 3)/(3 x 4)

D = 22/12 + 21/12

D = 43/12

E = 8/15 x 10/6

E = 8/6 x 10/15

E = (2 x 4)/(2 x 3) x (2 x 5)/(3 x 5)

E = 4/3 x 2/3

E = 8/9

F = -4/21 x 7/20

F = -4/20 x 7/21

F = -4/(4 x 5) x 7/(3 x 7)

F = -1/5 x 1/3

F = -1/15

G = 12/7 / 27/35

G = 12/7 x 35/27

G = 35/7 x 12/27

G = (7 x 5)/7 x (3 x 4)/(3 x 9)

G = 5 x 4/9

G = 20/9

H = -15/8 : 45/2

H = -15/8 x 2/45

H = -15/45 x 2/8

H = -15/(3 x 15) x 2/(2 x 4)

H = -1/3 x 1/4

H = -1/12

Exercice 2 :

A = 3/4 + 5/4 : (4/3 - 1/2)

A = 3/4 + 5/4 : (8/6 - 3/6)

A = 3/4 + 5/4 : (5/6)

A = 3/4 + 5/4 x 6/5

A = 3/4 + 6/4

A = 9/4

B = 5/7 + 1/7 x (5 + 1/2)

B = 5/7 + 1/7 x (10/2 + 1/2)

B = 5/7 + 1/7 x 11/2

B = 5/7 + 11/14

B = 10/14 + 11/14

B = 21/14

B = (3 x 7)/(2 x 7)

B = 3/2

C = (4/7 - 2)/(2 - 11/4)

C = (4/7 - 14/7)/(8/4 - 11/4)

C = (-10/7) / (-3/4)

C = -10/7 x (-4/3)

C = 10/7 x 4/3

C = 40/21