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nguyentuoi2k6bn
2 năm trước
Cho dãy $\frac{x}{a_{1}}$ + $\frac{x}{a_{2}}$ + $\frac{x}{a_{3}}$ + … + $\frac{x}{a_{100}}$ = 25. CMR trong dãy số đã cho có hai số bằng nhau
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