Фрагмент программы позволяет определить...

program P1;
uses
crt;
var
mas : array[1..20] of integer;
i,j,k : integer;
tmp : string;
begin

clrscr;

writeln('Start array: ');

for i := 1 to 20 do
begin

mas[i] := random(100);

write(mas[i],' ');

end;

for i := 1 to 20 do
begin

if mas[i] mod 2 = 0 then
mas[i] := 0;

end;

for i := 1 to 20 do
begin

if mas[i] = 0 then
begin

for j := 20 downto i do
if mas[j] <> 0 then
begin

k := mas[j];
mas[j] := mas[i];
mas[i] := k;

end;

end;

end;

writeln('');
writeln('Result array: ');

for i := 1 to 20 do
write(mas[i],' ');

readln(tmp);
read(tmp);

end.

Не уверен, что написал все верно, так как программа смогла найти только одну такую пару чисел, но все же...

954 - 459 = 495

program P1;
uses
crt;
var
i,j,k,n,x,y,z : integer;
begin

clrscr;

for i := 1 to 9 do
begin

for j := 0 to 9 do
begin

if i = j then
continue;

for k := 0 to 9 do
begin

if (j = k) or (i = k) then
continue;

if k*100+j*10+i < 100 then
continue;

n := (i*100+j*10+k) - (k*100+j*10+i);

if n > 100 then
begin

x := n div 100;
y := (n - x * 100) div 10;
z := n - (x*100+y*10);

if ((x = i) and (y = j) and (z = k)) or
((x = i) and (y = k) and (z = j)) or
((x = j) and (y = i) and (z = k)) or
((x = j) and (y = k) and (z = i)) or
((x = k) and (y = j) and (z = i)) or
((x = k) and (y = i) and (z = j)) then

writeln(i*100+j*10+k,' - ',k*100+j*10+i,' = ',n);

end;

end;

end;

end;

readln;
readln;

end.