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Sagot :

REGINEGALMAR

Réponse :

A = (1 - 4/5) : 2

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

A = (1x5/1x5 - 4/5) : 2

A = 5/5 - 4/5 : 2

A = 1/5 x 1/2

A = (1 x 1)/5x2)

A = 1/10

B = 1 - 4/5 : 2

B = 1 - 4/5 x 1/2

B = 1 - (4x1/5x2)

B = 1 - (2x2x1/2x5)

B = 1 - 2/5

B = 1/1 - 2/5

B = (1x5/1x5) - 2/5

B = 5/5 - 2/5

B = 3/5

Explications étape par étape

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