Tính: \( A = \frac{1}{3} + \frac{1}{9} + \frac{1}{27} + \ldots + \frac{1}{2187} + \frac{1}{6561} \)

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Toán 4 nâng cao
Câu 4: Tính: \( A = \frac{1}{3} + \frac{1}{9} + \frac{1}{27} + \ldots + \frac{1}{2187} + \frac{1}{6561} \)
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Câu 5: Tính: \( B = \frac{1}{4} + \frac{1}{8} + \frac{1}{16} + \ldots + \frac{1}{512} + \frac{1}{1024} \)
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