³√27-√9+√1-(4/5)²=?
问题描述：
³√27-√9+√1-(4/5)²=?
答
27^(1/3)-9^(1/2)+(1-(4/5)^2)^(1/2)
=3-3+(1-16/25)^(1/2)
=(9/25)^(1/2)
=3/5