Lời giải :
program hotrotinhoc ;
var a : array[1..32000] of integer ;
i,n,x,dem : integer ;
begin
write('Nhap gia tri cua x'); readln(x);
write('Nhap do dai cua day so n='); readln(n);
writeln('Nhap gia tri cua cac phan tu');
for i:= 1 to n do
begin
write('a[',i,']='); readln(a[i]);
end;
dem:=0;
for i:= 1 to n do
if a[i]=x then dem:=dem+1;
write('Trong day so n co tat ca ',dem,' so bang x');
readln
end.