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Câu 1: 

uses crt;

const fi='nguon.txt';

var f1:text;

a,b,c:integer;

begin

clrscr;

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

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

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

assign(f1,fi); rewrite(f1);

writeln(f1,a);

writeln(f1,b);

writeln(f1,c);

close(f1);

readln;

end.

Câu 2: 

const fi='nguon.txt';

fo='kq.txt';

var f1,f2:text;

a,b,c,max,min:integer;

begin

assign(f1,fi); reset(f1);

assign(f2,fo); rewrite(f2);

readln(f1,a);

readln(f1,b);

readln(f1,c);

writeln(f2,(a+b+c)/3:4:2);

max:=a;

if max<b then max:=b;

if max<c then max:=c;

writeln(f2,max);

min:=a;

if min>b then min:=b;

if min>c then min:=c;

writeln(f2,min);

close(f1);

close(f2);

end.

const fi='input.txt';

fo='output.txt';

var f1,f2:text;

a,b:integer;

begin

assign(f1,fi); reset(f1);

assign(f2,fo); rewrite(f2);

readln(f1,a,b);

writeln(f2,a+b);

close(f1);

close(f2);

end.

uses crt;

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

i,n,t:integer;

tb:real;

begin

clrscr;

readln(n);

for i:=1 to n do readln(a[i]);

t:=0;

for i:=1 to n do t:=t+a[i];

writeln(t/n:4:2);

tb:=t/n;

for i:=1 to n do 

  if a[i]<tb then write(a[i]:4);

readln;

end.

#include <bits/stdc++.h>

using namespace std;

long long a[10],b[10],i,j;

int main()

{

freopen("input.txt","r",stdin);

freopen("output.txt","w",stdout);

for (i=1; i<=10; i++) cin>>a[i];

for (j=1; j<=10; j++) cin>>b[j];

for (i=1; i<=10; i++)

cout<<a[i]+b[i]<<" ";

return 0;

}

const fi='dulieu.dat';

fo='tb.dat';

var f1,f2:text;

a,b:real;

begin

assign(f1,fi); reset(f1);

assign(f2,fo); rewrite(f2);

readln(f1,a);

readln(f1,b);

writeln(f2,(a+b)/2:4:2);

close(f1);

close(f2);

end.