Lời giải :
program hotrotinhoc ;
var a: array[1..1000] of integer ;
T,n,i : integer ;
begin
write('Nhap do dai cua day so'); readln(n);
writeln('Nhap cac phan tu cua day so');
for i:= 1 to n do
begin
write('a[',i,']='); readln(a[i]);
end;
T:=0;
for i:= 1 to n do
T:=T+a[i];
write('Tong cac phan tu da nhap la',T);
readln
end.