1:

uses crt;

var n,i,t:integer;

begin

clrscr;

readln(n);

t:=0;

for i:=1 to n do

t:=t+i*i;

write(t);

readln;

end.

2

program bt2;

var i,n,t:integer;

begin

readln(n);

s:=0;

for i:=1 to n do

if i mod 2 = 1 then s:=s+i;

readln;

end.

Câu 6:

uses crt;

var n,i:integer;

begin

clrscr;

readln(n);

for i:=1 to n do 

if n mod i=0 then write(i:4);

readln;

end.

5:

uses crt;

var n,i,dem:integer;

begin

clrscr;

readln(n);

dem:=0;

for i:=0 to n do

if i mod 2=1 then 

begin

write(i:4);

dem:=dem+1;

end;

writeln;

writeln(dem);

readln;

end.

Uses crt;

var n,i,s: integer;

begin clrscr;

readln(n);

for i:=1 to n do s:=s+1/i;

writeln(s);

readln;

end.

Chương trình tính tổng: 

n = int(input("Nhập n: "))

S = 0

for i in range(1, n+1):

     S = S + i

print("Tổng S là:", S)

Chương trình tính tích:

n = int(input("Nhập n: "))

T = 1

for i in range(1, n+1):

     T = T * i

print("Tích T là:", T)

Câu 1:

program Tinhtong:

var

     n, i, sum: integer;

begin

     write('Nhap n: ');

     readln(n);

     sum := 0;

     for i := 2 to n do

     begin

          if i mod 2 = 0 then

          begin

               sum := sum + i;

          end;

     end;

     writeln('Tong cac so chan tu 2 toi ', n, ' la ', sum);

     readln; 

end.

Câu 2:

program Tinhtong:

var

     n, i, sum: integer;

begin

     write('Nhap n: ');

     readln(n);

     sum := 0;

     for i := 1 to n do

     begin

          if i mod 2 = 1 then

          begin

               sum := sum + i;

          end;

     end;

     writeln('Tong cac so le tu 1 toi ', n, ' la ', sum);

     readln;

end.

Sao tới 3 end vậy

var i,n: integer;

       s:real;

begin

write(‘Nhập n: ‘); readln(n);

i:=1;

repeat 

s:=s+1/i;

i:=i+1;

until i=n;

write(‘s =‘, s:0:4);

readln

end.

Program Hotboy ;

Uses crt; 

Var n,i,s : real;

Begin

Writeln(‘nhap n’);  readln(n);

Repeat 

S:=S+ 1/i;

I:=i+1 ; 

Until n=i; 

Writeln(‘S=’,S);

Readln

End.

bạn tham khảo nha

Sửa đề: S=1/1+1/2+1/3+...+1/n

uses crt;

var n,i:integer;

s:real;

begin

clrscr;

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

s:=0;

for i:=1 to n do 

  s:=s+1/i;

writeln(s:4:2);

readln;

end.

program tong;

uses crt;

var n,i:integer;

t:longint;

begin

clrscr;

write('nhap n:'); readln(n);

t:=0;

for i:=1 to n do 

  t:=t+1/i;

writeln(t);

readln;

end.