uses crt;

var n,i:integer;

s:real;

begin

clrscr;

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

if (n>=0) and (n<=100) then

begin

s:=0;

for i:=1 to n do

s:=s+(i/(i+1));

writeln('tong la: ',s);

end

else writeln('vui long nhap lai');

readln;

end.

cảm ơn nha

1:

#include <bits/stdc++.h>

using namespace std;

long long a[100],i,n;

int main()

{

cin>>n;

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

cout<<"Day ban dau la: "<<endl;

for (i=1;i<=n; i++) cout<<a[i]<<" ";

cout<<endl;

sort(a+1,a+n+1);

cout<<"Day tang dan la: "<<endl;

for (i=1; i<=n; i++) cout<<a[i]<<" ";

return 0;

}

Var n,sc,sl,i:longint;

Begin

Write('N = ');readln(n);

Write('Cac so tu 1 den ',n,' la ');

For i:=1 to n do

Write(i:8);

Writeln;

For i:=1 to n do

Begin

If i mod 2 = 0 then sc:=sc+i

Else sl:=sl+i;

End;

Writeln('Tong cac so chan la ',sc);

Write('Tong cac so le la ',sl);

Readln

End.

uses crt;
var a:array[1..100]of integer;
i,n,x,dem,kt:integer;
begin
clrscr;
write('nhap n='); readln(n);
if n=1 then a[1]:=2
else begin
a[1]:=2;
x:=1;
dem:=1;
repeat
x:=x+2;
kt:=0;
for i:=2 to trunc(sqrt(x)) do
if x mod i=0 then kt:=1;
if kt=0 then begin
inc(dem);
a[dem]:=x;
end;
until dem=n;
end;
{-----------------------------------------}
writeln(n,' so nguyen to dau tien la:');
for i:=1 to n do
write(a[i]:4);
{--------------------------}
readln;
end.

uses crt;
var n,dem,dem1,i,t:integer;
tbc:real;
begin
clrscr;
write('n='); readln(n);
if (0<n) and (n<1000) then
begin
{----------------------dong-1----------------------}
dem:=0;
for i:=1 to n do
if i mod 2=1 then inc(dem);
writeln('so luong cac so nguyen le tu 1 toi ',n,' la: ',dem);
{---------------------dong-2-----------------------}
dem1:=0;
for i:=1 to n do
if i mod 2=0 then inc(dem1);
writeln('so luong cac so nguyen chan tu 1 toi ',n,' la: ',dem1);
{--------------------dong-3------------------------}
t:=0;
for i:=1 to n do
t:=t+i;
tbc:=t/n;
writeln('trung binh cong cac so nguyen tu 1 toi ',n,' la: ',tbc:4:2);
end
else writeln('vui long nhap lai');
readln;
end.

#include <bits/stdc++.h>
using namespace std;
long long a,b,bcnn;
int main()
{
    cin>>a>>b;
    if (a>b) swap(a,b);
    bcnn=b;
    while (bcnn%a!=0)
        bcnn=bcnn+b;
    cout<<bcnn;
    return 0;
}

uses crt;
var n,t:int64;
dem,i:integer;
begin
clrscr;
repeat
write('nhap n='); readln(n);
until (0<n) and (n<1000000000);
writeln('Cac so chinh phuong trong khoang tu 1 toi ',n,' la: ');
dem:=0;
t:=0;
for i:=1 to n do
if sqrt(i)=trunc(sqrt(i)) then
begin
write(i:6);
inc(dem);
t:=t+i;
end;
writeln;
writeln('So so chinh phuong trong khoang tu 1 toi ',n,' la: ',dem);
writeln('Tong cac so chinh phuong trong khoang tu 1 toi ',n,' la: ',t);
readln;
end.

1.

var n: integer;

begin

repeat

write('Nhap so n: '); readln(n);

until (n>=10) and (99>=n);

writeln('Chu so hang chuc la: ', n div 10);

writeln('Chu so hang don vi la: ', n mod 10);

end.

2.

var n,i: integer;

s: string;

begin

repeat

write('Nhap so n: '); readln(n);

until (n>=100) and (999>=n);

write('So moi la: ');

str(n,s);

for i:=length(s) downto 1 do write(s[i]);

end.