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Sagot :

Réponse :

Explications étape par étape

Bonsoir

Calculer et donner le résultat sous la forme d’une fraction irréductible :

A = -5/7 + 4/21

A = (-5 x 3)/(7 x 3) + 4/21

A = -15/21 + 4/21

A = (-15 + 4)/21

A = -11/21

B = 5/72 - 1/9

B = 5/72 - (1 x 8)/(9 x 8)

B = 5/72 - 8/72

B = (5 - 8)/72

B = (-3/72)

B = -3/(3 x 24)

B = -1/24

C = 2/3 x 1/8

C = 2/8 x 1/3

C = 2/(2 x 4) x 1/3

C = 1/4 x 1/3

C = 1/12

D = -7/9 : (6/-14)

D = -7/9 x (-14/6)

D = (7 x 14)/(9 x 6)

D = 98/54

E = 1/6 + 1/6 x 7/2

E = 1/6 + 7/12

E = (1 x 2)/(6 x 2) + 7/12

E = 2/12 + 7/12

E = (2 + 7)/12

E = 9/12

E = (3 x 3)/(3 x 4)

E = 3/4

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