1/(√5-2)=(√5+2)/[(√5-2)(√5+2)] =(√5+2)/(5-4) =√5+21/(√6-√5)=(√6+√5)/[(√6-√5)(√6+√5)] =(√5+√6)/(6-5) =√5+√6因为2=√4<√6，所以√5+2<√5+√6所以1/(√5-2)<1/(√6-√5)望采纳
