1.
var
a, b, c, d: integer;
sr: real;
begin
readln(a, b, c, d);
sr := (a+b+c+d)/4;
writeln(sr);
end.
2.
begin
writeln('Рост: 181');
writeln('Вес: 81');
writeln('Возраст: 28');
end.
3.
var
a, b, c, d: integer;
x1, x2: real;
begin
readln(a, b, c);
d := b*b-4*a*c;
if d > 0 then
begin
x1:=(-b+sqrt(d))/(2*a);
x2:=(-b-sqrt(d))/(2*a);
writeln(x1, ' ', x2);
end;
if d < 0 then
begin
x1:=-b/(2*a);
writeln(x1);
end;
if d > 0 then
writeln('Корней нет');
end.