Tổng $\frac{1}{1-x}+\frac{1}{1+x}+\frac{2}{1+x^{2}}+\frac{4}{1+x^{4}}

Question

Cơ bản

Tổng $\frac{1}{1-x}+\frac{1}{1+x}+\frac{2}{1+x^{2}}+\frac{4}{1+x^{4}}+\frac{8}{1+x^{8}}+\frac{16}{1+x^{16}}$ bằng:

4 câu trả lời

Answer 1

A.

$\frac{32}{1-x^{32}}$

Answer 2

$\frac{16(1-x^{16})}{1+x^{16}}$

Answer 3

$\frac{8(1-x^{16})}{1+x^{16}}$

Answer 4

$\frac{1-x^{16}}{1+x^{16}}$