Đặt A = \(1-\frac{1}{2}-\frac{1}{4}-\frac{1}{8}-\frac{1}{16}\)
\(\Rightarrow2A=2-1-\frac{1}{2}-\frac{1}{4}-\frac{1}{8}\)
\(\Rightarrow2A-A=1-1+\frac{1}{16}\)
\(\Rightarrow A=\frac{1}{16}\)
A = \(\frac{1}{16}\) nha e . nhớ tk cho a đấy . ^_*
=\(\frac{1}{16}\) nhé
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