Question

Mọi người ơi mình đang cần gắp ạ !

Đề bài đây

S = 1 +\(\dfrac{1}{2.3}\) + \(\dfrac{2}{3.4}\)+ ...+ \(\dfrac{n}{\left(n+1\right)-\left(n+2\right)}\)

CẢM ƠN MN TRƯỚC

Answer 1

Bạn ơi (n+1)(n+2) hay (n+1)-(n+2) vậy

Answer 2

var n,i:integer;

s:real;

begin

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

s:=0;

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

writeln(' Tong la: ',s);

readln;

end.

2) var n,i:integer;

s:real;

begin

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

s:=0;

for i:=1 to n do s:=s+(1/((2*i)-1));

writeln(' Tong la: ',);

readln;

end.

Answer 3

sửa đề: S = \(1+\dfrac{1}{2.3}+\dfrac{2}{3.4}+...+\dfrac{n}{\left(n+1\right).\left(n+2\right)}\)

var i,n:integer;

    s:real;

begin

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

s:=1;

for i:=1 to n do

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

write('S = ',s:10:2);

readln;

end.