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1.
var
  s: string;
  i, count: integer;
begin
  writeln('Vvedite stroky: ');
  readln(s);
  for i := 1 to length(s) - 2 do
    if copy(s, i, 3) = 'abc' then
      count := count + 1;
  writeln('Kol-vo: ', count);
end.
2.
var
  s1, s2: string;
  i, len1, len2: integer;
begin
  writeln('Vvedite stroky 1: ');
  readln(s1);
  writeln('Vvedite stroky 2: ');
  readln(s2);
  len1 := length(s1);
  len2 := length(s2);
  if len1 > len2 then writeln('1 stroka dlinnee')
  else if len1 < len2 then writeln('2 stroka dlinnee')
  else writeln('dlini strok ravnie')
end.
3.
var
  s1, s2, s3: string;
begin
  writeln('Vvedite stroky 1: ');
  readln(s1);
  writeln('Vvedite stroky 2: ');
  readln(s2);
  s3 := s1[1] + s1[2] + s2[1] + s2[2];
  writeln('Novaja stroka: ', s3);
end.

// PascalABC.NET 3.1, сборка 1218 от 12.04.2016
begin
  var m,n:integer;
  Write('Количество строк и столбцов матрицы: ');
  Read(n,m);
  var a:=MatrixRandom(n,m,10,99);
  for var i:=0 to n-1 do begin
    for var j:=0 to m-1 do Print(a[i,j]);
    Writeln
    end;
  var p:=ReadInteger('Введите число Р:');
  var b:array of integer;
  SetLength(b,4*m);
  var k:=0;
  for var i:=n-p to n-1 do
    for var j:=0 to m-1 do
      if a[i,j] mod 4=0 then begin
        b[k]:=a[i,j]; Inc(k)
        end;
  SetLength(b,k);
  b.Print
end.

Тестовое решение:
Количество строк и столбцов матрицы: 6 8
67 70 68 72 38 72 96 38
49 75 24 55 72 63 21 40
72 12 60 22 74 30 13 45
22 45 39 24 35 97 64 31
76 62 15 94 56 28 31 13
41 67 75 37 67 13 25 20
Введите число Р: 4
72 12 60 24 64 76 56 28 20