如图,AD是△ABC的中线,AE是△ABD的中线,若DE=3cm,则EC=____cm.
—What will the phone ?
—The same as you said, eight hundred dollars each.
知函数fx在-5,5上是偶函数,且在0,5上是单调函数,若f-4<f-2,则下列不等式一定成立的是( )