Réponses

2013-04-18T17:19:28+02:00

56)

6.9=2.5+4*x
4x=4.4
x=1.1

57)

6+6+(2l)=19
19-12=2l

l=7/2=3.5

58)

72=2a+3a
a=72/5=14.4

2013-04-18T17:55:20+02:00