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calculer et donner le résultat sous forme d’une fraction irréductible

(exercice 22 A et B)
calculer et donner le résultat sous forme d’une fraction irréductible

(exercice 22 A et B)
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A = -7/6 - 11/12 + 5/9
A = (-7 x 6)/(6 x 6) - (11 x 3)/(12 x 3) + (5 x 4)/(9 x 4)
A = -42/36 - 33/36 + 20/36
A = -75/36 + 20/36
A = -55/36
B = (5/32 + 3/16) - (7/8 - 1/12)
B = (5/32 + (3 x 2)/(16 x 2)) - ((7 x 3)/(8 x 3) - (1 x 2)/(12 x 2))
B = (5/32 + 6/32) - (21/24 - 2/24)
B = 11/32 - 19/24
B = -8/24
B = -8/(3 x 8)
B = -1/3