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nhucaibang
2 năm trước
a) Tìm a ∈ N nhỏ nhất sao cho a chia 5 chia 5 dư 1, chia cho 7 dư 5 và chia cho 11 dư 2. b) $Tính : S =\frac{38}{25} + \frac{9}{10} - \frac{11}{5} + \frac{13}{21} - \frac{15}{28} + \frac{17}{36} - ... + \frac{197}{4851} - \frac{199}{4950}$
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