1. Tìm m, n $in$ $mathbb{Z}$ biết: $frac{9}{m}$ - $frac{n}{4}$ = $frac{3}{8}$ 2. Chứng minh rằng $frac{1}{2}$ - $frac{1}{4}$ + $frac{1}{8}$ - $frac{1}{16}$ + $frac{1}{32}$ - $frac{1}{64}$ < $frac{1}{3}$

1. Tìm m, n $\in$ $\mathbb{Z}$ biết: $\frac{9}{m}$ - $\frac{n}{4}$ = $\frac{3}{8}$ 2. Chứng minh rằng $\frac{1}{2}$ - $\frac{1}{4}$ + $\frac{1}{8}$ - $\frac{1}{16}$ + $\frac{1}{32}$ - $\frac{1}{64}$ < $\frac{1}{3}$
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