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Help *** TÍNH nhanh: `a)` $\frac{1}{10}$ + $\frac{2}{10}$ + $\frac{3}{10}$ + $\frac{4}{10}$ + $\frac{5}{10}$ + $\frac{6}{10}$ + $\frac{7}{10}$ + $\frac{8}{10}$ + $\frac{9}{10}$ `b)` `4343/ 7171` + `4343/ 7171` + `4343/ 7171` + `4343/ 7171`
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