Question

stuiind ca a+b+c=13 calculeaza:3a+3b+3c;5a+5b+5c+12;10a+10b+10c-100;11a+11b+11c+309;1000-(25a+25b+25c);a+(b+c);repede!!!!!!!

Answer 1

1). 3a+3b+3c=3(a+b+c)=3*13=39 ;
2). 5a+5b+5c+12=5(a+b+c)+12=
     =5*13+12=77 ;
3). ...=10(a+b+c)-100=10*13-100=30 ;
4). =11(a+b+c)+309=11*13+309=
     =143+309=452 ;
5). ...=1000-25(a+b+c)=1000-25*13=675 ;
6). a+(b+c) = a+b+c = 13 ;