Răspuns :
a=a
b=a+1
c=a+2
a+b+c=783
a+a+1+a+2=783
3a+3=783
3a=783-3
3a=780
a=780:3
a=260
b=260+1
b=261
c=260+2
c=262
b=a+1
c=a+2
a+b+c=783
a+a+1+a+2=783
3a+3=783
3a=783-3
3a=780
a=780:3
a=260
b=260+1
b=261
c=260+2
c=262