Răspuns :
Răspuns:
a+b=12 I·2=>2a+2b=24
b+c=9 I·4 =>4b+4c=36
2a+2b+4b+4c=60
2a+6b+4c=60
a+b=12
b+c=9
2a+6b+4=?
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12-9=3(b)
12-3=9(a)
9-3=6(c)
6(2a)+18(6b)+28(4c)=24+28=52
scuze ca nu am raspuns mai repede, dar mi sa sters raspunsul