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Sagot :

Réponse :

B= 3/7-1/5*(5/2+2)

B= 3/7-1/5(5/2+4/2)

B= 3/7-1/5*9/2

B= 3/7-1*9/5*2

B= 3/7-9/10

B = (30-63)/70 = -33/70

Explications étape par étape

Bonjour !

B = 3/7 - 1/5 * (5/2 + 2)

B = 3/7 - 1/5 * (5/2 + 4/2)

B = 3/7 - 1/5 * 9/2

B = 3/7 - 9/10

B = (3 * 10)/(7 * 10) - (9 * 7)/(10 * 7)

B = 30/70 - 63/70

B = - 33/70.

Bonne journée !

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