Question

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 $\sqrt{80}/ // \sqrt{200} / // \sqrt{20} / // \sqrt{30} /// ( )10 \sqrt{2} ///( ) \sqrt{2.3.5} ///( ) 4 \sqrt{5}/// ( ) 2 \sqrt{5}$

Answer 1

√80 = √16.5 = 4√5
√200 = √100.2 = 10√2
√20 = √4.5 = 2√5
√30 = √2.3.5