Réponses

2012-04-15T13:04:41+02:00

si j'ai bien compris c'est :

3/4 x 20/7 + (5/14)/9

= 3x20 / (4x7) + 5/(14x9)

= 60/28 + 5/126

= 15x4 /(7x4) + 5 / (18x7)

= 15x4x18/(7x4x18) + 5x4/(18x7x4)

= 1100/(7x4x18)

= 275/(7x18)

= 275/126