```cpp
#include <iostream>
using namespace std;

int main() {
int n = 36; // tổng số con
int m = 100; // tổng số chân

int g = (2*n - m/2)/3; int c = (4*n - 2*m)/6; if (g + c == n &amp;&amp; 2*g + 4*c == m &amp;&amp; m % 2 == 0) { cout &lt;&lt; &quot;So con ga: &quot; &lt;&lt; g &lt;&lt; endl; cout &lt;&lt; &quot;So con cho: &quot; &lt;&lt; c &lt;&lt; endl; } else { cout &lt;&lt; &quot;Khong co dap an&quot; &lt;&lt; endl; } return 0;

}
```

Kết quả khi chạy chương trình sẽ là:
```
So con ga: 22
So con cho: 14
```

#include <iostream>

int main() {
    int n, m;
    std::cout << "Nhap tong so con (n): ";
    std::cin >> n;
    std::cout << "Nhap tong so chan (m): ";
    std::cin >> m;

    int g, c;  // g: so luong ga, c: so luong cho

    // Giai he phuong trinh
    c = (4 * n - m) / 2;
    g = n - c;

    // Kiem tra ket qua
    if (c < 0 || g < 0 || (m % 2 != 0) || (4 * n - m) % 2 != 0) {
        std::cout << "Khong ton tai gia tri hop le cho so luong ga va cho!" << std::endl;
    } else {
        std::cout << "So luong ga: " << g << std::endl;
        std::cout << "So luong cho: " << c << std::endl;
    }

    return 0;
}

Mình dùng C++ nên div = /; mod = % nha bn!

#include <bits/stdc++.h>
using namespace std;
int main() {
int a, S;
cin >> a;
S=0;
while(a>0)
{
    S+=a%10, a=a/10;
}
cout << S << endl;
return 0;
}

Chúc bn học tốt!

#include <bits/stdc++.h>

using namespace std;

long long a[1000],i,n,t;

int main()

{

cin>>n;

for (i=1; i<=n; i++) cin>>a[i];

t=0;

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

if (a[i]%2==0 && i%2==1) t+=a[i];

cout<<t;

return 0;

}

#include <bits/stdc++.h>

using namespace std;

long long a[10000],i,n,t1,t2,dem1,dem2;

int main()

{

cin>>n;

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

cin>>a[i];

dem1=0;

dem2=0;

t1=0;

t2=0;

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

{

if (a[i]>0)

{

dem1++;

t1+=a[i];

}

if (a[i]<0)

{

dem2++;

t2+=a[i];

}

}

long long t3=0;

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

if (i%2==1) t3+=a[i];

long long t4=0;

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

if (i%2==1 && a[i]%2==0) t4+=a[i];

 cout<<t1<<" "<<t2<<endl;

cout<<dem1<<" "<<dem2<<endl;

cout<<t3<<endl;

cout<<t4<<endl;

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

if (a[i]%3==0) cout<<a[i]<<" ";

return 0;

}

Bài 2:

uses crt;

var n,i,t:integer;

begin

clrscr;

readln(n);

t:=0;

for i:=1 to n do

if (i mod 3=0) and (i mod 5=0) then t:=t+i;

writeln(t);

readln;

end.

program tong;
uses crt;
var M, N, S, i: integer;
begin
clrscr;
write ('Nhap M= '); readln(M);
write ('Nhap N= '); readln(N);
s : = 0;
for i := M to N do if (i mod 2 = 0) then s:= s + i;
write (T'ong cac so chan trong pham vi tu M den N = ',s);
readln;
end.

mk mới làm tổng thui nghen

Program Tong_hieu_tich_thuong;

Uses crt;

Var a:integer;

b:integer;

Begin

clrscr;

write(‘nhap so thu 1 :’);

readln(a);

writeln(‘ban vua nhap so: ‘,a);

write(‘nhap so thu hai :’);

readln(b);

writeln(‘ban vua nhap so thu 2: ‘,b);

Writeln(a,’+’,b,’=’,a+b);

Writeln(a,’-‘,b,’=’,a-b);

Writeln(a,’*’,b,’=’,a*b);

if b<>0 then 

Writeln(a,’/’,b,’=’,a/b);

readln;

End.

bạn in ra đc chx mình làm cái mới rùi đó

uses crt;

var a,vtmax,vtmin:array[1..100]of integer;       

 n,i,max,min,dem,t,dem1,t1,dem2,t2,dem3,t3,dem4,t4,k:integer;

begin

clrscr;

write('Nhap n='); readln(n);

for i:=1 to n do 

begin     

write('A[',i,']='); readln(a[i]); 

end;

max:=a[1];

for i:=1 to n do 

if max<a[i] then max:=a[i];

writeln('So lon nhat trong day la: ',max);

dem:=0;

t:=0;

for i:=1 to n do 

if max=a[i] then     

begin       

inc(dem);

t:=t+a[i];       

vtmax[dem]:=i;     

end;

if dem>1 then   

begin     

writeln('Tong cac so max la: ',t);     

writeln('Cac vi tri co so max la: ');     

for i:=1 to dem do       

write(vtmax[i]:4);   

end;

min:=a[1];

for i:=1 to n do 

if min>a[i] then min:=a[i];

writeln('So nho nhat trong day la: ',min);

dem1:=0;

t1:=0;

for i:=1 to n do 

if min=a[i] then     

begin       

inc(dem1);       

t1:=t1+a[i];       

vtmin[dem1]:=i;     

end;

if dem1>1 then   

begin     

writeln('Tong cac so min la: ',t1);     

writeln('Cac vi tri co so min la: ');     

for i:=1 to dem1 do       

write(vtmin[i]:4);   

end;

write('Nhap k='); readln(k);

dem2:=0;

t2:=0;

for i:=1 to n do 

if (i mod 2=0) and (a[i] mod k=0) then     

begin       

dem2:=dem2+1;       

t2:=t2+a[i];     

end;

writeln('So phan tu o vi tri chan trong day la boi cua ',k,' la: ',dem2);

writeln('Tong cac so o vi tri chan trong day la boi cua ',k,' la: ',t2);

dem3:=0;

t3:=0;

for i:=1 to n do 

if (i mod 2=1) and (k mod a[i]=0) then     

begin       

inc(dem3);       

t3:=t3+a[i];     

end;

writeln('So phan tu o vi tri le trong day la uoc cua ',k,' la: ',dem3);

writeln('Tong cac so o vi tri le trong day la uoc cua ',k,' la: ',t3);

dem4:=0;

t4:=0;

for i:=1 to n do 

if (a[i]+k=1) or (a[i]=k+1) then     

begin       

inc(dem4);       

t4:=t4+a[i];     

end;

writeln('So phan tu la anh em cua ',k,' trong day la: ',dem4);

writeln('Tong cac phan tu la anh em cua ',k,' trong day la: ',t4);

readln;

end.