Réponse :

Explications étape par étape

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A = 1 - 1/3 - 1/4 x 2/5

A = 3/3 - 1/3 - 2/4 x 1/5

A = 2/3 - 1/2 x 1/5

A = 2/3 - 1/10

A = (2 x 10)/(3 x 10) - (1 x 3)/(3 x 10)

A = 20/30 - 3/30

A = 17/30

B = (1 - 1/3 - 1/4) x 2/5

B = (12/12 - 4/12 - 3/12) x 2/5

B = (12/12 - 7/12) x 2/5

B = 5/12 x 2/5

B = 5/5 x 2/12

B = 1/6

C = (1 - 1/3 - 1/4) / (2/5)

C = (12/12 - 4/12 - 3/12) x 5/2

C = 5/12 x 5/2

C = 25/24

D = 1 - (1/3 + 1/4) x 2/5

D = 1 - (4/12 + 3/12) x 2/5

D = 1 - 7/12 x 2/5

D = 1 - 7/5 x 2/12

D = 1 - 7/5 x 1/6

D = 30/30 - 7/30

D = 23/30