Question

Daca a,b,c sunt nr. naturale astfel incat :
a+b+c=57 si
2a+b+2c=73
calculati :(a+c)*(5*a+2*b+5*c)

Answer 1

a+b+c=57
2(a+b+c)=2*57
2a+2b+2c=114
2a+b+2c=73
(2a+2b+2c)-(2a+b+2c)=114-73
b=41
(a+b+c)-b=57-41
a+c=16
(a+c)(5a+2b+5c)
a+c=16
5a+5c=5(a+c)=5*16=80
2b=41*2=82
16*(80+82)=16*162=2592