#include <bits/stdc++.h>

using namespace std;

long long a,b;

int main()

{

cin>>a>>b;

long long t=a+b;

if (t>0 && t%3==0) cout<<"YES";

else cout<<"NO";

return 0;

}

uses crt;

var a,b,c:real;

kt:integer;

begin

clrscr;

repeat

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

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

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

until (a>0) and (b>0) and (c>0);

if (a+b>c) and (a+c>b) and (b+c>a) then 

begin

kt:=0;

if (a=b) and (a<>c) and (b<>c) then kt:=1;

if (b=c) and (b<>a) and (c<>a) then kt:=1;

if (c=a) and (c<>b) and (a<>b) then kt:=1;

if kt=0 then writeln('Day khong la tam giac can')

else writeln('Day la tam giac can');

end

else writeln('Day khong la ba canh trong mot tam giac');

readln;

end.

uses crt;

var a,b,c:real;

begin

clrscr;

readln(a,b,c);

if (a>0) and (b>0) and (c>0) and (a+b>c) and (a+c>b) and (b+c>a) then 

begin

if (a=b) and (b=c) then write('Day la tam giac deu')

else writeln('Day khong la tam giac deu');

end

else writeln('Day khong la ba canh trong mot tam giac');

readln;

end.

Tham khảo:

uses crt;

Var a,b,i : Integer ;

Begin

Clrscr ;

Write ('Nhap a: '); readln (a);

Write ('Nhap b: '); readln (b);

i:=a + b;

If i mod 2 = 0 then writeln ('Tong hai so ',a,' va ',b,' la ',i,', day la mot so chan')

Else writeln ('Tong hai so ',a,' va ',b,' la ',i,', day la mot so le');

Readln ;

End.

#include <bits/stdc++.h>

using namespace std;

long long a,b,t;

int main()

{

cin>>a>>b;

t=a+b;

if (t>0) cout<<"Tong la so duong";

else if (t<0) cout<<"Tong la so am";

else cout<<"Tong la so 0";

cout<<endl;

if (t%2==0) cout<<"Tong co chia het cho 2";

else cout<<"Tong khong chia het cho 2";

return 0;

}

2:

#include <bits/stdc++.h>

using namespace std;

int main()

{

int n,i,kt=0;

cin>>n;

for (int i=2; i*i<=n; i++)

if (n%i==0) kt=1;

if (kt==0) cout<<"YES";

else cout<<"NO";

}

python.

N = input(nhap so nguyen N)

if n%2 == 0:

      print('N la so chan')

else:

      print('N la so le')

#include <bits/stdc++.h>

using namespace std;

long long n;

int main()

{

cin>>n;

if (n%2!=0) cout<<"La so le";

else cout<<"Khong la so le";

return 0;

}

Thuật toán: 

-Bước 1: Nhập n

-Bước 2: Nếu \(\sqrt{n}=trunc\left(\sqrt{n}\right)\) thì n là số chính phương

không thì n không phải là số chính phương

-Bước 3: Kết thúc.

Viết chương trình

uses crt;

var n:integer;

begin

clrscr;

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

if n<0 then writeln(n,' khong la so chinh phuong')

else begin

             if sqrt(n)=trunc(sqrt(n)) then writeln(n,' la so chinh phuong')

             else writeln(n,' khong la so chinh phuong');

       end;

readln;

end.