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const fi='dulieu.txt';

fo='ketqua.txt';

var f1,f2:text;

m,n,i,t:integer;

begin

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

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

readln(f1,m,n);

t:=0;

for i:=m to n do 

 if i mod 3=0 then t:=t+i;

writeln(f2,t);

close(f1);

close(f2);

end.

uses crt;

const fi='dlra.txt';

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

i,n,h:integer;

f1:text;

begin

clrscr;

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

for i:=1 to n do

 begin

write('A[',i,']='); readln(a[i]);

end;

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

h:=0;

for i:=1 to n do 

  if a[i] mod 3<>0 then 

begin

write(f1,a[i]:4);

h:=h-a[i];

end;

writeln(f1);

writeln(f1,h);

close(f1);

readln;

end.

Bạn viết hết đề ra đi bạn 

Bài 1: 

uses crt;

var s,i:integer;

begin

clrscr;

s:=0;

for i:=3 to 372 do 

 if i mod 3=0 then s:=s+i;

writeln(s);

readln;

end.

Bài 2: 

uses crt;

var n,i,t,x,y,d:integer;

st:string;

begin

clrscr;

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

str(n,st);

t:=0;

d:=length(st);

for i:=1 to d do 

  begin

val(st[i],x,y);

t:=t+x;

end;

writeln(t);

readln;

end.

const fi='dulieu.txt';

fo='ketqua.txt';

var f1,f2:text;

m,n,i,t:integer;

begin

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

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

readln(f1,m,n);

t:=0;

for i:=m to n do 

 if i mod 2=0 then t:=t+i;

writeln(f2,t);

close(f1);

close(f2);

end.

uses crt;

const fi='dlra.txt';

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

i,n,h:integer;

f1:text;

begin

clrscr;

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

for i:=1 to n do

 begin

write('A[',i,']='); readln(a[i]);

end;

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

h:=0;

for i:=1 to n do 

  if a[i] mod 2=0 then 

begin

write(f1,a[i]:4);

h:=h+a[i];

end;

writeln(f1);

writeln(f1,h);

close(f1);

readln;

end.

uses crt;

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

i,n,dem,tb:integer;

begin

clrscr;

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

for i:=1 to n do 

begin

write('A[',i,']='); readln(a[i]);

end;

tb:=0;

dem:=0;

for i:=1 to n do 

 if (50<=a[i]) and (a[i]<=150) then

begin

tb:=tb+a[i];

inc(dem);

end;

writeln('Ket qua la: ',tb/dem:4:2);

readln;

end.

const fi='kt.txt';

fo='kq.out';

var f1,f2:text;

s:string;

i,dem,d:integer;

begin

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

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

readln(f1,s);

d:=length(s);

dem:=0;

for i:=1 to d do 

 if s[i]='e' then inc(dem);

writeln(f2,dem);

close(f1);

close(f2);

end.

const fi='kt.txt';

fo='kq.out';

var f1,f2:text;

s:string;

i,dem,d:integer;

begin

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

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

readln(f1,s);

vt:=pos('anh',s);

while vt<>0 do

begin

delete(s,vt,3);

insert(s,vt,'em');

vt:=pos('anh',s);

end;

writeln(f2,s);

close(f1);

close(f2);

end.

const fi='kt.txt';

fo='kq.out';

var f1,f2:text;

s:string;

i,dem,d:integer;

begin

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

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

readln(f1,s);

d:=length(s);

dem:=0;

for i:=1 to d do 

 if s[i]='e' then inc(dem);

writeln(f2,dem);

close(f1);

close(f2);

end.