câu 1:
uses crt;
var i,n: longint;
begin
clrscr;
repeat
write('Nhap n: '); readln(n);
until n>0;
for i:=1 to 4 do
writeln('Dien tich la: ',n*n);
readln;
end.
câu 2:
uses crt;
var n,m,s:integer;
t:longint;
begin
clrscr;
s:=0;
t:=1;
write('Nhap m: '); readln(m);
write('Nhap n: '); readln(n);
for i:=m to n do
if i mod 2=1 then
begin
s:=s+i;
t:=t*i;
end;
writeln('tong cua m va n la: ',s);
write('Tich cua m va n la: ',t);
readln;
end.