Question

Viết chương trình tính tổng \(\frac{2}{1.3}\)+\(\frac{2}{3.5}\)+\(\frac{2}{5.7}\)+.....+\(\frac{2}{n.\left(n+2\right)}\)

Answer 1

Lời giải :

program hotrotinhoc ;

var T : real ;

i,n : integer ;

begin

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

S:=0;

for i:= 1 to n do

if i mod 2=1 then

S:=S+2/(i*(i+2));

write('Tong la :',S);

readln

end.

Answer 2

uses crt;
var a:array[1..10000000] of longint;
i,n,d:longint;
s:real;
begin
clrscr;
write('Nhap n la ');readln(n);
for i:=1 to n do begin
if i mod 2<>0 then
s:=s+(2/(i*(i+2))); end;
write('Tong la ',s:0:2);
readln
end.