const
n = 20;
var
Arr: array [1 .. n] of real;
i: integer;
a: real;
begin
writeln('Введите a');
readln(a);
for i := 1 to Length(Arr) do
begin
Arr[i] := random(20);
write(' ', Arr[i]:0:3);
end;
writeln();
for i := 1 to Length(Arr) do
begin
Arr[i] := Arr[i] / 2;
Arr[i] := Arr[i] - a;
Arr[i] := Arr[i] / Arr[1];
end;
for i := 1 to Length(Arr) do
begin
write(' ', Arr[i]:0:3);
end;
end.