(2+根号5)3(2-根号5)四次方
问题描述:
(2+根号5)3(2-根号5)四次方
答
=(2+根号5)^3(2-根号5)^3(2-根号5)
=[(2+根号5)(2-根号5)]^3(2-根号5)
=(4-5)^3(2-根号5)
=(-1)^3(2-根号5)
=根号5-2