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Stiind ca a+2b egal 60 si b+3d+2c)80, aflati valoarea sumei:S egal 3a+11b+15d+10c=120

Răspuns :

3a+6b+5b+15d+10c=3(a+2B)+ 5(B+3D +2c)= 3*60+5*80.=180+400=580