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2 năm trước
CMR: $\frac{1}{3}$ + $\frac{2}{$3^{2}$ }$ +$\frac{3}{$3^{3}$ }$ +$\frac{4}{$3^{4}$ }$ + ... +$\frac{100}{$3^{100}$ }$ +$\frac{101}{$3^{101}$ }$ < $\frac{3}{4}$ Hứa hay cho ctlhn
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