Réponses

2014-03-31T19:44:38+02:00
1) 8 - 5 x 3/7
= 8 - 15/7
= 8x7 / 1x7 - 15/7
= 56/7 - 15/7
= 41/7

2) 2/9 + 7/9 x 11/2
= 2/9 + 77/18
= 2x2 / 9x2 + 77/18
= 4/18 + 77/18
= 81/18
= 9x9 / 9x2
= 9/2

3) 11/12 x 4 - 4 x 2/3
= 44/12 - 8/3
= 44/12 - 8x4 / 3x4
= 44/12 - 32/12
= 12/12
= 1