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uses crt;
var i,n:integer;
A:real;
begin
clrscr;
write('Nhap so n: '); readln(n);
while i<-n do begin
A:-A+1/(i*(1+2));
i:=i+1;
end;
writeln('Tong A= ',A:2:3);
readin
end.
8:1
Legendary.pas
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