问题标题：
计算;⑴3√2/√27;⑵√8/√2A;⑶(√b/5)/(√b/20a^2)(a>0)写一下过程!
问题描述：
计算;⑴3√2/√27;⑵√8/√2A;⑶(√b/5)/(√b/20a^2)(a>0)写一下过程!
戴卫东回答：
⑴3√2/√27
=3√2/3√3
=√2/√3
=√6/3
⑵√8/√(2A)
=√(8/2A)
=√(4/A)
=2√A/A
⑶(√b/5)/(√b/20a^2)
=√[(b/5)/(b/20a²)]
=√(4a²)
=|2a|
=2a
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