a. \(\sqrt {25.121} = \sqrt {25} .\sqrt {121} = 5.11 = 55.\)
b. \(\sqrt 2 .\sqrt {\frac{9}{8}} = \sqrt {2.\frac{9}{8}} = \sqrt {\frac{9}{4}} = \frac{3}{2}\).
c. \(\sqrt {10} .\sqrt {5,2} .\sqrt {52} = \sqrt {10.5,2.52} = \sqrt {52.52} = 52\).
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