（化简）根号9分之40
问题描述：
（化简）根号9分之40
答
=√[(4/9)×10]
=√[(2/3)²×10]
=(2/3)√10
（化简）根号9分之40
=√[(4/9)×10]
=√[(2/3)²×10]
=(2/3)√10