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Sagot :

Réponse :

A = - 4/7 X 5/2                 B = 3/2 X 7/9

a. A = -20/14 = (2 X -10)/(2 X 7) = -10/7

b. B = 21/18 = (3 X 7)/(3 X 6) = 7/6

c. C = A + B

C = -10/7 + 7/6 = (-10 X 6)/(7 X 6) + (7 X 7)/(6 X 7) = -60/42 + 49/42 = -11/42

Explications étape par étape

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