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Daca a+b=27 si b+c=7 sa se afle 3a+5b+2c=
Multumesc.


Răspuns :

3a+5b+2c=3a+3b+2b+2c=3(a+b)+2(b+c)=3*27+2*7
3a+5b+2c=3a+2b+2c=3(a+b)+2(b+c)=3·27+2·7=81+14=95