(3+根号下5-根号下3)(3-根号下5+根号下3)等于
问题描述:
(3+根号下5-根号下3)(3-根号下5+根号下3)等于
答
(3+根号下5-根号下3)(3-根号下5+根号下3)
=3²-(√5-√3)²
=9-(5-2√15+3)
=1+2√15