Réponses

2013-11-20T19:15:19+01:00
2013-11-20T19:33:56+01:00
a) 8x + 7x + 6=15x+6

b) 17m - 11m + 8-5=6m+3

c) 4a + 12a + 9=16a+9

d) 3m + m + 1 + 4=4m+5