1. S = 2 + 4 + 6 +…+ n 2. S = 3 + 5 + 7 +…+ n

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1. 1/

   Program BTH;
   uses crt;
   var s:real;
   i,n:longint;
   Begin
           clrscr;
           write(‘Nhap n: ‘);readln(n);
           For i:=2 to n do
           Begin
                   If i mod 2=1 then s:=s+1/i;
           end;
           writeln(‘Tong day so tren la: ‘,s:4:2);
           readln;
   end.

   2/

   Program BTH;
   uses crt;
   var s:real;
   i,n:longint;
   Begin
           clrscr;
           write(‘Nhap n: ‘);readln(n);
           For i:=2 to n do
           Begin
                   If i mod 2=0 then s:=s+1/i;
           end;
           writeln(‘Tong day so tren la: ‘,s:4:2);
           readln;
   end.

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