Câu 1:
uses crt;
var a:longint; i:integer;
begin
clrscr;
A:=1;
for i:=1 to 19 do if i mod 2 = 1 then A:=A*i;
write('Tich la: ',A);
readln;
end.
Câu 2:
uses crt;
var a:array[1..10] of integer;
i,tong:integer;
begin
clrscr;
for i:=1 to 10 do
begin
read(a[i]);
if a[i] mod 2 = 0 then tong:=tong+a[i];
end;
writeln('Day vua nhap la: ');
for i:=1 to 10 do write(a[i],' ');
writeln;
write('Tong cac so chan co trong day vua nhap la: ',tong);
readln;
end.