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Mathematics, 22.09.2020 21:01 j015

Calculati: $\frac{2}{3 \times 5} + \frac{3}{5 \times 8} + \frac{4}{8 \times 12} + \frac{5}{12 \times 17} + \frac{6}{17 \times 23} + \frac{7}{23 \times 30}$
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