Question

Tính tổng dãy số sau:

1+\(\frac{1}{1+3}\)+\(\frac{1}{3+5}+\frac{1}{5+7}\)+.....+ \(\frac{1}{n.\left(n+2\right)}\)

Answer 1

uses crt;

var n,i:integer;

s:real;

begin

clrscr;

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

s:=1;

for i:=1 to n do

s:=s+1/(i+(i+2));

writeln('Ket qua la: ',s:4:2);

readln;

end.

Answer 2

Program HOC24;

var t: real;

i,n: integer;

begin

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

t:=1;

for i:=1 to n do

t:=s+1/(i*(i+2));

write('Tong cua day so la : ',t);

readln

end.