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Sagot :

Réponse :

Bonjour

Explications étape par étape :

B = 1/4 + 5/3 X -1/8

B = 1/4 -5/24

B = 1/4 X 6/6 - 5/24

B = 6/24 -5/24

B = 1/24

D = (8/15 -7/5) X (-1/6 + 2/9)

D = (8/15 -7/5 X 3/3) X (-1/6 X 9/9 + 2/9 X 6/6)

D = (8/15 -21/15) X (-9/54 + 12/54)

D = -13/15 X 3/54

D = - 39/ 810 = -13/270

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