Réponse :
Explications étape par étape
Bonjour
A = 2/7 x 9/4
A = 2/4 x 9/7
A = 2/(2 x 2) x 9/7
A = 1/2 x 9/7
A = 9/(2 x 7)
A = 9/14
B = 5 x 7/15
B = 5/15 x 7
B = 5/(3 x 5) x 7
B = 1/3 x 7
B = 7/3
C = 36/35 x 21/12
C = 36/12 x 21/35
C = (3 x 12)/12 x (3 x 7)/(5 x 7)
C = 3 x 3/5
C = 9/5
A = 1/2 - 1/3 - 1/6
A = (1 x 3)/(2 x 3) - (1 x 2)/(3 x 2) - 1/6
A = 3/6 - 2/6 - 1/6
A = (3 - 2 - 1)/6
A = 0
B = 7/4 - 15/4 x 1/5
B = 7/4 - 15/5 x 1/4
B = 7/4 - (3 x 5)/5 x 1/4
B = 7/4 - 3 x 1/4
B = 7/4 - 3/4
B = 4/4
B = 1
C = (3 - 2/9)/(5/6 - 5/9)
C = [(3 x 9)/9 - 2/9] / [(5 x 3)/(6 x 3) - (5 x 2)/(9 x 2)]
C = (27/9 - 2/9) / (15/18 - 10/18)
C = 25/9 / 5/18
C = 25/9 x 18/5
C = 25/5 x 18/9
C = (5 x 5)/5 x (2 x 9)/9
C = 5 x 2
C = 10
