1+(根号5+2)分之1-根号5

问题描述:

1+(根号5+2)分之1-根号5

1+(根号5+2)分之1-根号5
=1+1/(√5+2)-√5
=1+(√5-2)/(5-4)-√5
=1+√5-2-√5
=1-2
=-1