Найти сумму элементов последовательности с точностью 0,001:
S=1 + 2/(2*3) - 4/(3*9) + 6/(5*27) - 8/(8*81) + 10/(13*243) - ...
S=1 + 2/(2*3) - 4/(3*9) + 6/(5*27) - 8/(8*81) + 10/(13*243) - ...
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Verified answer
Conste = 0.000001;
var
i, f, f1, thn, t: integer;
s, s1: real;
begin
i := 0;
f1 := 1;
f := 2;
thn := -1;
s := 1;
s1 := 0;
repeat
i := i + 1;
s1 := s;
thn := thn * -3;
s := s + 2 * i / f / thn;
writeln(2 * i, ' ', f, ' ', thn, ' ', s);
t := f1;
f1 := f;
f := f + t
until abs(abs(s1) - abs(s)) < e;
writeln(s);
end.