Răspunsuri

2014-11-09T15:19:47+02:00
2014-11-09T15:23:52+02:00
A+b=30
a+c=40
b+c=50
2a+2b+2c=120
a+b+c=120:2=60
a+b=30
c=60-30
c=30
a+c=40
a+30=40
a=40-30
a=10
b+c=50
b+30=50
b=50-30
b=20