Bonsoir, pouvez vous me corriger en cas de faute dans mes calculs merci.

Réponse :

Explications étape par étape

Bonsoir

A = 1 - 3/4 x 1/5

À = 1 - 3/20

A = 20/20 - 3/20

A = 17/20

B = 1 - 3/4 + 4/5

B = 20/20 - (3 x 5)/(4 x 5) + (4 x 4)/(5 x 4)

B = 20/20 - 15/20 + 16/20

B = 36/20 - 15/20

B = 21/20

C = 1 - 3/4 : 4/5

C = 1 - 3/4 x 5/4

C = 1 - 15/16

C = 16/16 - 15/16

C = 1/16

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

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

D = 1 - (15/20 + 4/20)

D = 20/20 - 19/20

D = 1/20

M = 1 / [1 + 2 / (1 + 1/2)]

M = 1 / [1 + 2/(2/2 + 1/2)]

M = 1 / [1 + 2/(3/2)]

M = 1 / [1 + 2 x 2/3]

M = 1 / [1 + 4/3]

M = 1 / (3/3 + 4/3)

M = 1 / (7/3)

M = 1 x 3/7

M = 3/7