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a) Daca a+b=3,08 si b+c=0,55, atunci calculati 3a+7b+4c.
b) Daca a+b=3,3 si a+c=2,2 , atunci calculati 5a+3b+2c.


Răspuns :

a+b=3,08 Ix3
b+c=0,55 I x4
3a+3b+4b+4c=9,24+2,20
3a+7b+4c=11,44

a+b=3,3 I x3
a+c=2,2 Ix2
3a+3b+2a+2c=9,9+4,4
5a+3b+2c=14,3