uses crt;
const n=20;
m=4;
var a:array[1..n,1..n] of integer;
b:array[1..m,1..m] of real;
d,i,j,l,k:integer;
sr:real;
begin
clrscr;
randomize;
writeln('Массив* A:');
for i:=1 to n do
begin
for j:=1 to n do
begin
a[i,j]:=random(10);
write(a[i,j]:3);
end;
writeln;
end;
write('Нажмите Enter');
readln;
d:=n div m;
for i:=1 to m do
for j:=1 to m do
begin
sr:=0;
for k:=(i-1)*d+1 to i*d do
for l:=(j-1)*d+1 to j*d do
sr:=sr+a[k,l];
b[i,j]:=sr/(d*d);
end;
writeln('Массив средних значений квадратов:');
for i:=1 to m do
begin
for j:=1 to m do
write(b[i,j]:5:1);
writeln;
end;
readln
end.