如图,在△ABC中,点D在AB上,下列条件能使△BCD和△ABC相似的是( )
A:∠ACD=∠B
B:∠ADC=∠ACB
C:AC2=AD•AB
D:BC2=BD•BA
若方程ax﹣6=3x+2y是关于x、y的二元一次方程,则a满足( )
一Sara.Let's go to the playground to watch the basketball game!
一Good idea! I wonder which group will win.
设定义在R上的偶函数fx满足fx+2=fx,f'x是fx的导函数,当x∈0,1时,0≤fx≤1;当x∈0,2且x≠1时,xx-1f'x<0.则方程fx=lgx根的个数为( )