Tính: a) \({{\sqrt {999} } \over {\sqrt {111} }}\) b) \({{\sqrt {52} } \over {\sqrt {117} }}\)
a) \({{\sqrt {999} } \over {\sqrt {111} }} = \sqrt {{{999} \over {111}}} = \sqrt 9 = 3\)
b) \({{\sqrt {52} } \over {\sqrt {117} }} = \sqrt {{{52} \over {117}}} = \sqrt {{4 \over 9}} = 3\)
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