Question

daca a b c sunt nr. nat.si a+b+c=18 iar 2a+b+2c=25 calculati

(a+c)×(3a+2b+3c).

Answer 1

a=3 ; b=11 ; c=4
3+11+4=18
2•3+11+2•4=6+11+8=25
(a+c)•(3a+2b+3c)=(3+4)•(3•3+2•11+3•4)
=7•(9+22+12)=7•43=301