已知0<x<1,则x2,x,1x大小关系是( ) A.x2<x<1x B.x<x2<1x C.x<1x<x2 D.1x<x<x2
问题描述:
已知0<x<1,则x2,x,
大小关系是( )1 x
A. x2<x<
1 x
B. x<x2<
1 x
C. x<
<x21 x
D.
<x<x2 1 x
答
∵0<x<1,
∴可假设x=0.1,
则 x2=(0.1)2=
,1 100
=1 x
=10,1 0.1
∵
<0.1<10,1 100
∴x2<x<
.1 x
故选A.