Bonjour,
Calculer et donner le résultat sous la forme simplifiée :
A= (9/7 - 3/4) x 2/5
A = [(9 x 4) / (7 x 4) - (3 x 7) / (4 x 7)] x 2/5
A = (36/28 - 21/28) x 2/5
A = 15/28 x 2/5
A = 30/140
A = (10 x 3) / (10 x 14)
A = 3/14.
B=(2/5 - 1/10) : (2/3 + 1/10)
B = [(2 x 2) / (5 x 2) - 1/10] : [(2 x 10) / (3 x 10) + (1 x 3) / (10 x 3)]
B = (4/10 - 1/10) : (20/30 + 3/30)
B = 3/10 : 23/30
B = 3/10 x 30/23
B = 90/230
B = (10 x 9) / (10 x 23)
B = 9/23.
