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0064. Sikl4
Time limit : 1000 ms
Memory limit : 64 mb
Berilgan ketma-ketlikni dastlabki $n$ ta xadi yig’indisini toping
$$S = \frac{1}{x^2} - \frac{1}{x^4} + \frac{1}{x^6} - ...+ (-1)^{n-1} \frac{1}{x^{2n}}$$
Kiruvchi ma’lumotlar:
ikkita butun son $n$ va $x$ $(0 \le n,x \le 9)$;
Chiquvchi ma’lumotlar:
$S$ – ketma-ketlikni dastlabki $n$ ta xadi yig’indisi javob $10^{-3}$ aniqlikda chiqarilsin
Input |
---|
1 2 |
Output |
0.250 |
Input |
---|
2 3 |
Output |
0.099 |