It's around 500 metres from my home to school.
A:above
B:about
C:at
D:on
如图,正五边形ABCDE内接于⊙O,连接对角线AC,AD,则下列判断中错误的是( )
对于任意的t∈1,2,函数fx=x3+2-m2x2-2x在区间t,3上总不是单调函数,求m的取值范围是( )