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