program bai1;
var n:real;
begin
write('N= ');readln(n);
writeln('So dao nguoc cua ',n,' la 1/,n);
readln
end.
program bai1;
var n,t:longint;
s:real;
begin
write('N= ');readln(n);
t:=n;
while n<>0 do
begin
S:=S*10+n mod 10;
n:=n div 10;
end;
If S=t then writeln('so doi xung')
else writeln('khong doi xung');
readln;
end.
bổ sung thên
writeln('Ket qua la ',s);