câu 2:
uses crt;
var a: array[1..100] of integer;
i,n,s: integer;
begin
clrscr;
write ('nhap n: '); readln (n);
for i:=1 to n do
begin
write ('nhap phan tu thu ',i,': '); readln (a[i]);
if a[i] mod 2=0 then s:=s+a[i];
end;
writeln ('mang A la: ');
for i:=1 to n do write (a[i]:3);
writeln;
if (s>=10) and (s<100) then writeln ('0')
else writeln ('tong cac phan tu chan la: ',s);
readln;
end.