Toán Lớp 5: frac{1}{5}+frac{1}{10}+frac{1}{20}+frac{1}{40}+ldots+frac{1}{1280} -

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Toán Lớp 5: \frac{1}{5}+\frac{1}{10}+\frac{1}{20}+\frac{1}{40}+\ldots+\frac{1}{1280}