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Réponse :

Explications étape par étape

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A = -5/7 - (3/2 - 5/4)

A = -5/7 - [(3 x 2)/(2 x 2) - 5/4]

A = -5/7 - (6/4 - 5/4)

A = -5/7 - 1/4

A = (-5 x 4)/(7 x 4) - (1 x 7)/(4 x 7)

A = -20/28 - 7/28

A = -27/28

B = -5/8 + 5/12

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

B = -15/24 + 10/24

B = -5/24

C = -28/27 x 36/7

C = -28/7 x 36/27

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

C = -4 x 4/3

C = -16/3

D = 4/3 + 7/6 x -2/5

D = 4/3 - 2/6 x 7/5

D = 4/3 - 2/(3 x 2) x 7/5

D = 4/3 - 1/3 x 7/5

D = 4/3 - 7/15

D = (4 x 5)/(3 x 5) - 7/15

D = 20/15 - 7/15

D = 13/15

E = (8/15 - 2/5) x (3 + 9/2)

E = (8/15 - 6/15) x (6/2 + 9/2)

E = 2/15 x 15/2

E = 2/2 x 15/15

E = 1