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2014-05-17T18:12:26+03:00
2r+4c=10
1r-0,5=c

2r+4(r-0,5)=10
2r+4r-2=10
6r=10+2
6r=12
r=2lei/kg

c=2-0,5=1,5lei/kg
1 5 1
2014-05-17T18:13:20+03:00
2r +4c = 10 | :2
r + 2c= 5 lei
c= r- 0,5)
r + 2(r- 0,5)
r -1 +2r= 5lei
3r= 6lei
r= 6 lei :3= 2lei
c= 1,5 lei