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Daca a=18 si b+c=57 calculati ex a+5*b+5*c                3*a+2*b+2*c a*b+a*c+7*b+7*c

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a+5*b+5*c=a+5(b+c)=18+5*57=18+285=303

3*a+2*b+2*c=3*18+2(57)=54+114=168

a*b+a*c+7*b+7*c=18*57+7*57=57*25=1425

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