Find the sum of the expression\(\frac{1}{{\sqrt 1 + \sqrt 2 }} + \frac{1}{{ {\sqrt2 + \sqrt 3 } }} + \frac{1}{{\sqrt 3 + \sqrt 4 }} + \ldots + \frac{1}{{\sqrt {80} + \sqrt {81} }}\)

Find the sum of the expression\(\frac{1}{{\sqrt 1 + \sqrt 2 }} + \frac

1.	Find the sum of the expression\(\frac{1}{{\sqrt 1 + \sqrt 2 }} + \frac{1}{{ {\sqrt2 + \sqrt 3 } }} + \frac{1}{{\sqrt 3 + \sqrt 4 }} + \ldots + \frac{1}{{\sqrt {80} + \sqrt {81} }}\)
A.	7
B.	8
C.	9
D.	10
Answer» C. 9

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Find the sum of the expression\(\frac{1}{{\sqrt 1 + \sqrt 2 }} + \frac{1}{{ {\sqrt2 + \sqrt 3 } }} + \frac{1}{{\sqrt 3 + \sqrt 4 }} + \ldots + \frac{1}{{\sqrt {80} + \sqrt {81} }}\)

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