2:

#include <bits/stdc++.h>

using namespace std;

long long a,b;

int main()

{

cin>>a>>b;

cout<<a%b<<endl;

cout<<a/b;

return 0;

}

Bài 3: 

#include <bits/stdc++.h>

using namespace std;

long long a,b;

int main()

{

cin>>a>>b;

cout<<a%b;

cout<<a/b;

return 0;

}

#include <bits/stdc++.h>

using namespace std;

long double a;

int main()

{

cin>>a;

cout<<fixed<<setprecision(2)<<a*a;

return 0;

}

program timtich;

uses  crt;

var i,n:integer;

tich:longint;

a:array[1..100]of integer;

begin

clrscr;

write('nhap so n:');readln(n);

for i:=1 to n do

begin

write('nhap phan tu a[',i,']:');readln(a[i]);

end;

for i:=1 to n do

write(a[i]:4);

tich:=1;

writeln;

for i:=1 to n do

if a[i] mod 2=0 then tich:=tich*a[i];

writeln('tich ca phan tu chan cua mang la:',tich);

readln;

end.

program timtong;

uses  crt;

var i,n:integer;

tong:longint;

a:array[1..100]of integer;

begin

clrscr;

write('nhap so n:');readln(n);

for i:=1 to n do

begin

write('nhap phan tu a[',i,']:');readln(a[i]);

end;

for i:=1 to n do

write(a[i]:4);

tong:=0;

writeln;

for i:=1 to n do

if a[i] mod 2=0 then tong:=tong+a[i];

writeln('tong cac phan tu chan cua mang la:',tong);

tong:=0;

writeln;

for i:=1 to n do

if a[i] mod 2=1 then tong:=tong+a[i];

writeln('tong cac phan tu le cua mang la:',tong);

readln;

end.

Bài 1: 

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('A[',i,']='); readln(a[i]);

end;

s:=1;

for i:=1 to n do 

  if a[i] mod 2=0 then s:=s*a[i];

writeln(s);

readln;

end.

#include <bits/stdc++.h>

using namespace std;

long long n,i,x,s,t;

int main()

{

cin>>n;

s=1;

t=0;

for (i=1; i<=n; i++)

{

cin>>x;

t+=x;

s*=x;

}

cout<<t<<endl;

cout<<s;

return 0;

}

#include <bits/stdc++.h>

using namespace std;

long long i,n,s;

int main()

{

cin>>n;

s=1;

for (i=1; i<=n; i++) if (i%2==0) s*=i;

cout<<s;

return 0;

}