Toán Lớp 7: B = $\frac{1}{1.1985}$ + $\frac{1}{2 . 1986}$ + $\frac{1}{1 . 1987}$ + … + $\frac{1}{16 . 2000}$
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Toán Lớp 7: B = $\frac{1}{1.1985}$ + $\frac{1}{2 . 1986}$ + $\frac{1}{1 . 1987}$ + … + $\frac{1}{16 . 2000}$
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