(3倍根号3加根号5)(3倍根号3减根号5)拜托各位大神

问题描述:

(3倍根号3加根号5)(3倍根号3减根号5)拜托各位大神

(3√3+√5)(3√3-√5) =(3√3)^2-(√5)^2 =27-5 =22