Với \(a \ge 0;\,\,b \ge 0\) , chứng tỏ \(\sqrt {\left( {{a^2}b} \right)} = a\sqrt b \)
\(\sqrt {\left( {{a^2}b} \right)} = \sqrt {\left( {{a^2}} \right).} \sqrt b = a\sqrt b \,\,\left( {o\,\,a \ge 0,\,\,b \ge 0} \right)\)
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