Tính : a) căn 2/căn18
Giải thích
a) Ta có: \[\frac{{\sqrt 2 }}{{\sqrt {18} }} = \sqrt {\frac{2}{{18}}} = \sqrt {\frac{1}{9}} = \frac{1}{3}\]. Ta có \[\frac{{\sqrt {15} }}{{\sqrt {735} }} = \sqrt {\frac{{15}}{{735}}} = \sqrt {\frac{1}{{49}}} = \frac{1}{7}\].
b) Ta có: \[\frac{{\sqrt {12500} }}{{\sqrt {500} }} = \sqrt {\frac{{12500}}{{500}}} = \sqrt {25} = 5\]. \[\sqrt {\frac{{{6^5}}}{{{2^3}{{.3}^5}}}} = \sqrt {\frac{{{2^5}{{.3}^5}}}{{{2^3}{{.3}^5}}}} = \sqrt 4 = 2\].