Question

2.fie numerele naturale consecutive pare a,b,c. Stiind ca a < b < c, iar a+c=10,calculeaza a x b + a x c

Answer 1

a=x
b=x+2
c=x+4
a+c=x+x+4=2*x+4
2*x+4=10
2*x=10-4 
2*x=6
x=6:2
x=3
a=3
b=5
c=7
a *b +a*c =3*5+3*7= 15+21=36