Const
   N = 3;
   M = 4;
Var
   T:array[1..N,1..M] of integer;
   i,j:integer;
Begin
Randomize;
WriteLn('Было:');
For i:= 1 to N do
    Begin
    For j:= 1 to M do
        Begin
        T[i,j]:=random(3000);
        Write(T[i,j]:6,' ');
        if (99 < T[i,j])and(T[i,j]<1000)and(T[i,j] mod 7 = 0) then T[i,j]:=T[i,j]-10;
        End;
    WriteLn
    End;
WriteLn('Стало:');
For i:= 1 to N do
    Begin
    For j:= 1 to M do
       Write(T[i,j]:6,' ');
    WriteLn
    End;
End.


Было:
  2280    893   1825     21
   491     97    666    402
  1961   2639   1873   1069
Стало:
  2280    893   1825     21
   491     97    666    402
  1961   2639   1873   1069

Const n=4; m=5;
var a:array[1..n,1..m] of integer;
i,j:integer;
begin
for i:=1 to n do
 begin
 for j:=1 to m do
  begin
  a[i,j]:=random(1000);
  write(a[i,j]:4);
  end;
 writeln;
 end;
for i:=1 to n do
 for j:=1 to m do
   if (a[i,j] mod 7=0)and(a[i,j]>99)and(a[i,j]<1000) then a[i,j]:=a[i,j]-10;
writeln('New:');
for i:=1 to n do
  begin
 for j:=1 to m do write(a[i,j]:4);
 writeln;
 end;
end.

Пример889 188 17 186 772
394 121 406 679 936
 20 147 868 691 450
525 73 575 232 416
New:
879 188 17 186 772
394 121 396 669 936
 20 137 858 691 450
515 73 575 232 416