Réponses

2013-02-08T16:59:22+01:00
3 X x + 3 X 4 = 3x + 12 5 X 2 + 5 X -1 = 10 + -5 = 5
2013-02-08T17:01:33+01:00

3(x+4) + 5(2x-1) + 2(x+15) + 3(x-2)

= 3x + 12 + 10x -5 +2x +30 +3x -6

= 18x + 31