Réponses

2014-01-04T15:16:55+01:00


1) n+40=2 x 40 --> n+40=28 --> n+40-40=28-40 --> n= -12

2) 40=2(14+n) --> 40=28+2n --> 40-28=40+2n-40 --> 12=2n --> n=12 / 2 --> n=6

3)n+40=2(14+n) -->n+40=28+2n -->n+40-n=28+2n-n -->40=28+n --> 40-28= 28+n-28 --> 12=n