Помогите! Ну оооочень нужно!

[tex] \frac{1}{1+ \sqrt{2} } + \frac{1}{ \sqrt{2}+ \sqrt{3} } + \frac{1}{ \sqrt{3}+ \sqrt{4} } +...+ \frac{1}{ \sqrt{80}+ \sqrt{81} } [/tex]
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