a+b+c= 243
b=a+1
c=a+2
a+a+1+a+2=243
3a+3=243
3a=243-3
3a=240
a=240:3
a= 80
b=81
c=82
Răspuns:
a
a+b+c=a+(a+1)+(a+2)=3a+3=243 => 3a=240 => a=80, b=81, c=82
