Bài 1: 

#include <bits/stdc++.h>

using namespace std;

long long i,n,x,t;

int main()

{

cin>>n;

t=0;

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

{

cin>>x;

if (x%15==0) t=t+x;

}

cout<<t;

return 0;

}

2:

#include <bits/stdc++.h>

using namespace std;

long long n,i;

int main()

{

cin>>n;

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

if (n%i==0) cout<<i<<" ";

return 0;

}

Program Tinhtong;
Uses Crt;
var i,S: integer;
begin
Clrscr;
S:=0;
For i :=1 to 7 do S:=S+i;
Writeln('Tong cac so tu 1 den 7 la ',S);
End.

giúp em với

Câu 3:

program cauba;

int chieudai, chieurong, chuvi, dientich :real;

begin

write('Chieu dai la: '); Readln(chieudai);

write('Chieu rong la: '); Readln(chieurong);

chuvi = (chieudai + chieu rong)*2;

dientich= chieudai*chieurong;

writeln('Chu vi la: ',chuvi);

writeln('Dien tich la: ',dientich);

end.

Caua1:

program caumot;

begin

writeln('lop 8A chao ban!');

end.

Câu 2:

program cauhai;

int a,b,c :real;

begin

write('a='); readln(a);

write('b='); readln(b);

c= a+b;

write('Tong hai so a b la:',c);

end.

Tạo chương trình như sau:

uses crt;

var s,i:integer;

begin

clrscr;

s:=0;

for i:=15 to 25 do 

  s:=s+i;

writeln(s);

readln;

end.

Câu 1:

Program HOC24;

var i,p: integer;

t: longint;

begin

write('Nhap P: '); readln(p);

t:=0;

for i:=1 to p do if i mod 2<>0 then t:=t+i;

write('Tong cac so le la: ',t);

readln

end.

Câu 2:

Program HOC24;

var i,n: integer;

t: longint;

begin

write('Nhap N: '); readln(n);

t:=0;

for i:=1 to n do if i mod 2=0 then t:=t+i;

write('Tong cac so chan la: ',t);

readln

end.

Câu 3:

Program HOC24;

var i,t,n: integer;

begin

write('Nhap N: '); readln(n);

t:=0;

for i:=1 to n do if n mod i=0 then t:=t+i;

write('Tong cac uoc cua ',n,' la: ',t);

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;

}