Răspunsuri

2014-09-24T16:18:40+03:00
2014-09-24T16:49:03+03:00
4a+5b+c=20/2
4a+5b+c=10
4a+b+c=10/5
4a+b+c=2
a+b+c=4/2
a+b+c=2