log根号2(根号(6+4根号2)-根号(6-4根号2))
问题描述:
log根号2(根号(6+4根号2)-根号(6-4根号2))
= log_sqrt(2)(sqrt((2+sqrt(2))^2) - sqrt((2-sqrt(2))^2))= log_sqrt(2)((2+sqrt(2))-(2-sqrt(2)))= log_sqrt(2)(2sqrt(2))= log_sqrt(2)((sqrt(2))^3)= 3
答
根号(6+4根号2)=根号(2+根号2)的平方=2+根号2
根号(6-4根号2)=根号(2-根号2)的平方=2-根号2
所以
log根号2(根号(6+4根号2)-根号(6-4根号2))
=log根号2(2+根号2-2+根号2)
=log根号2(2根号2)
=log根号2(根号2)的立方
=3