1.

The expression \(\frac{{15\left( {\sqrt {10} + \sqrt 5 } \right)}}{{\sqrt {10\;} + \sqrt {20} + \sqrt {40} - \sqrt 5 - \sqrt {80} }}\) is equal to:

A. 5(3 + 2√2)
B. 5 -2√5
C. 5 + 2√2
D. 10(3 +2√5)
Answer» B. 5 -2√5


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