Информатика 8-ой класс.

Const
    n = 3;
    m = 3;

var
    i, j: integer;
    a, b: array[1..n, 1..m] of integer;

begin
    for i := 1 to n do
    begin
        for j := 1 to m do
        begin
            a[i, j] := random(20) - 10;
            write(a[i, j]:3, ' ');
        end;
        writeln;
    end;
    writeln;
    
    for i := 1 to n do
    begin
        for j := 1 to m do
        begin
            if ((i + j) mod 2 = 1) and (a[i, j] < 0) then
                a[i, j] := sqr(a[i, j]);
            write(a[i, j]:4, ' ');
        end;
        writeln;
    end;
end.

1)

var

  s : real;

  i, n : integer;

begin

  s := 0;

  read (n);

  for i := 1 to n do s := s + 1 / i;

  writeln (s);

end.

 

2)

var

  a, i : integer;

begin

  a := 1;

  for i := 1 to 8 do

  begin

    a := a * 2;

    writeln ('Через ', i * 3, 'часов будет ', a, ' амеб');

  end;

end.

 

3)

var

  n, i : integer;

  x, s : real;

begin

  s := 0;

  read (n, x);

  for i := 1 to n do

    s := s + sin (i * x);

  writeln (s);

end.

 

4)

var

  n, a, r, i : integer;

begin

  r := 1;

  read (a, n);

  for i := 1 to n do r := r * a;

  writeln (r);

end.