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maibeo1992001
2 năm trước
(x+ $\frac{1}{5}$)+(x+ $\frac{1}{6}$)+(x+ $\frac{1}{10}$)+(x+ $\frac{1}{15}$ )+(x+ $\frac{1}{21}$)+(x+ $\frac{1}{28}$)+(x+$\frac{1}{36}$)= 8$\frac{7}{9}$
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