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Найдите последовательно значение каждой из разностей:
[tex] \frac{1}{2}- \frac{1}{3}, \frac{1}{3}-\frac{1}{4},\frac{1}{4}-\frac{1}{5},\frac{1}{5}-\frac{1}{6},\frac{1}{6}-\frac{1}{7},\frac{1}{7}-\frac{1}{8}[/tex]
а затем значение суммы [tex] \frac{1}{6}+ \frac{1}{12}+ \frac{1}{20}+ \frac{1}{30}+ \frac{1}{42}+ \frac{1}{56}[/tex]
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