Вычислите:
[tex]1 - \frac{1}{10 \times 11} + \frac{1}{11 \times 12} + \frac{1}{12 \times 13} + \frac{1}{13 \times 14} + \frac{1}{14 \times 15} [/tex]
Объясните пожалуйста как решить!))
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