A:not; a lot of
B:no; little
C:no; a lot
D:not; a few
设a=logπ3,b=log34,c=log417,则( )
若函数f(x)的图象与函数gx=13x的图象关于直线y=x对称,求f(2x﹣x2)的单调递减区间.