lên mạng đi bạn 

làm Pascal khó lắm

b: 

#include <bits/stdc++.h>

using namespace std;

long long a,b,t;

int main()

{

cin>>a>>b;

t=a+b;

cout<<t;

return 0;

}

b: 

#include <bits/stdc++.h>

using namespace std;

long long a,b,t;

int main()

{

cin>>a>>b;

t=a+b;

cout<<t;

return 0;

}

2: 

#include <bits/stdc++.h>

using namespace std;

int main()

{

string st;

int a;

cin>>st;

cin>>a;

cout<<"Xin chao "<<st<<endl;

cout<<"Nam nay "<<st<<" "<<2021-a<<" tuoi";

return 0;

}

#include <bits/stdc++.h>

using namespace std;

double a,b,c,tb;

int main()

{

cin>>a>>b>>c;

tb=(a+b+c)/3;

cout<<fixed<<setprecision(1)<<tb<<endl;

if (tb>=8) cout<<"Gioi";

else if ((6.5<=tb) and (tb<8)) cout<<"Kha";

else if ((5<=tb) and (tb<=6.5)) cout<<"Trung Binh";

else cout<<"Chua dat";

return 0;

}

uses crt;

var a,b:integer;

begin

clrscr;

readln(a,b);

writeln(a*b);

if (a>0) then writeln('a la so nguyen duong')

else writeln('a la so nguyen am');

readln;

end.

nếu chạy ct mà nó không dừng lại thì bấm alt+F5 nhá

uses crt;

var a:integer;

begin

clrscr;

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

if a>0 then writeln(a,' la so duong')

else if a<0 then writeln(a,' la so am')

else writeln(a,' khong la so am cung khong la so duong');

readln;

end.

program soamsoduong;

uses crt;

var

a:integer;

begin

clrscr;

write('nhap vao a:');readln(a);

if a>0 then write('so am la',a)

else write ('so duong la ', a)

readln; 

end.