uses crt;
const nmax=20;
var a:array[1..nmax,1..nmax] of integer;
n,m,i,j:byte;
begin
clrscr;
randomize;
repeat
write('Количество строк=');
readln(n);
until n in [1..nmax];
repeat
write('Количество столбцов=');
readln(m);
until m in [1..nmax];
writeln('Исходная матрица:');
for i:=1 to n do
begin
for j:=1 to m do
begin
a[i,j]:=random(50);
write(a[i,j]:4);
end;
writeln;
end;
writeln;
for i:=1 to n-1 do
for j:=1 to m do
a[i,j]:=a[i,j]-a[n,j];
writeln;
writeln('Результат вычитания:');
for i:=1 to n do
begin
for j:=1 to m do
write(a[i,j]:4);
writeln;
end;
readln
end.