Câu 1:
uses crt;
var i,s:integer;
begin
clrscr;
s:=0;
for i:=1 to 50 do
s:=s+i;
writeln('tong tu 1 toi 50 la: ',s);
readln;
end.
Câu 2:
uses crt;
var i,j:byte;
begin
clrscr;
for i:=1 to 5 do
writeln('Vinatinhoc');
for j:=1 to 5 do
writeln('.net');
readln;
end.
Câu 3:
uses crt;
var i:byte;
begin
clrscr;
for i:=1 to 10 do
writeln('Vinatinhoc.net');
readln;
end.