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kimtrinh080
2 năm trước
6.Tính nhanh A= $\frac{5}{6}$+$\frac{11}{12}$+$\frac{19}{20}$+$\frac{29}{30}$+$\frac{41}{42}$+$\frac{55}{56}$+ $\frac{71}{72}$+$\frac{89}{90}$
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