1)
program ct;
uses crt;
var i,n,d:integer;
begin clrscr;
write('Nhap so nguyen: '); readln(n);
if n mod 2=0 then write(n,' la so chan')
else write(n,' la so le')
for i:=1 to n do
if n mod i=0 then inc(d);
if d=2 then writeln(n,' la so nguyen to')
else writeln(n,' khong la so nguyen to');
readln;
end.
2)
program ct;
uses crt;
var A:array[1..1000] of integer;
i,n:integer;
S:longint;
begin clrscr;
write('Nhap so phan tu: '); readln(n);
for i:=1 to n do
begin
write('Nhap phan tu thu ',i,': '); readln(A[i]);
end;
S:=0;
for i:=1 to n do
if A[i] mod 2=0 then S:=S+A[i];
writeln('Tong cac so chan la: ',S);
writeln('Cac so chia het cho 3 la: ');
for i:=1 to n do
if A[i] mod 3=0 then write(A[i] :3)
readln;
end.
3)
program ct;
uses crt;
var n:integer;
i:real;
const sc=0.003;
begin clrscr;
i:=1; n:=1;
while i>=sc do
begin
i:=1/n;
n:=n+1;
end;
write('So ',n-1,' la be nhat de 1/n<,'sc);
readln;
end.
Học tốt!
