var x, y, s: integer;begin readln(x, y); s := (2*x + y) * (x-y); writeln(s);end.
3) 1. = A1
2. = $A$1
3. = $A1
а) = A2+B2
= A3+B3
б) =$A$1+B2
=$A$1+B3
в) =$A2+B2
=$A3+B3