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tien.nguyen104486
2 năm trước
Bài 3 : Tính a, $\frac{44}{57}$ + $\frac{44}{79}$ + ... + $\frac{44}{59.61}$ b, $\frac{3^{2}}{10.11.12}$ + $\frac{3^{2}}{12.13.14}$ + ... + $\frac{3^{2}}{49.50.51}$ E cần gấp mn ơi
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