下列表達式不正確的有()。(多選)A經(jīng)營差異率=經(jīng)營資產(chǎn)利潤率-稅后利息率B凈資產(chǎn)收益率=(稅后經(jīng)營利潤-利息)/平均股東權(quán)益C凈經(jīng)營資產(chǎn)利潤率=經(jīng)營利潤率x凈經(jīng)營資產(chǎn)周轉(zhuǎn)次數(shù)D杠桿貢獻率=經(jīng)營差異率x凈財務(wù)杠桿