根号4x-x2小于x的解集是多少呢？

首先根号4x-x2>=0,则x>=0

而根号里面4x-x2>=0 0<=x<=4

两边平方得：4x-x2<=x2 x>=2或x<=0

于是综上2<=x<=4

x>2

用()代表根号下

(4X-X2)<X

4X-X2>=0 解得 0<=x<=4

两边平方得：4x-x2<=x2 x>=2或x<=0

于是综上2<=x<=4

***左边无等号***

首先根号4x-x2>=0,则x>=0

而根号里面4x-x2>=0 0<=x<=4

两边平方得：4x-x2<x2 x>2或x<0

于是综上2<x<=4