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var n,i,s:longint;
begin clrscr;
wroite('n=');readln(n);
s:=0;
for i:=1 to n do s:=s+2*i+1;
write(s);
readln;
end.

A:
uses crt;
var t,i,n:integer;
begin
clrscr;
write('Nhap n='); readln(n);
t:=0;
for i:=1 to n do
t:=t+i;
writeln(t);
readln;
end.
B:
uses crt;
var a:array[1..100]of integer;
i,n,t:integer;
begin
clrscr;
write('Nhap m='); readln(m);
for i:=1 to m do
begin
write('A[',i,']='); readln(a[i]);
end;
t:=0;
for i:=1 to m do
t:=t+a[i];
writeln(t);
readln;
end.

Program tinhtong;
Var n,s,i: integer;
Begin
Write('Hay nhap gia tri cua n'); Readln(n);
s:=0;
For i:=1 to n do s:=1/(2*i+1);
Write('Vay gia tri cua S la: ',s);
End.

Var i,n:integer;
S:real;
Begin
Write (' nhap n :');
Readln(n);
S:=1;
For i:= 1 to n do S:= S+1/i;
Writeln (' tong S:',S);
Readln;
end.

Lời giải:
program hotrotinhoc ;
var s: real ;
i,n : integer ;
begin
write('n='); readln(n);
for i:= 1 to n do
s:=s+1/(i*i) ;
write('s=',s);
readln
end.
uses crt;
var a:array[1..10000000] of longint;
i,n,d:longint;
s:real;
begin
clrscr;
s:=1;
write('Nhap n la ');readln(n);
for i:=2 to n do
s:=s+(1/(i*i));
write('Tong la ',s:0:2);
readln
end.
uses crt;
var a:array[1..10000000] of longint;
i,n,d:longint;
s:real;
begin
clrscr;
s:=1;
write('Nhap n la ');readln(n);
for i:=2 to n do
s:=s+(1/(i*i));
write('Tong la ',s:0:2);
readln
end.
Var i, n : integer;
S : real;
Begin
Write (‘n=’); read(n);
S:=1;
For i:= 1 to n do S:= S + 1/(i+2);
Write(S);
Readln;
End.
program bai1;
var s,i,n:longint;
begin
write('N= ');
readln(n);
s:=0;
for i:=1 to n do if i mod 2=1 then s:=s+1/i;
write('s= ',s);
readln
end.