【正文】
( ) A? ?2,1 B? ?2,1 C? ?3,2 D? ?3,2 2.設(shè)函數(shù)???? ?? ?? )1(1 )1()( xx xxxf則 f[f(1)]= ( ) A 0 B 1 C 2 D 3 3. 函數(shù) y = log2 ( x2 – 5x – 6 )單調(diào)遞減區(qū)間是 ( ) A )25,(?? B ),25( ?? C )1,( ??? D ),6( ?? 4.下列函數(shù)與 y=x有相同圖像的一個(gè)函數(shù)是 ( ) A 2xy? B xxy 2? C )1,0(log ??? aaay xa D )1,0(log ??? aay xaa 5.已知 x0時(shí) ,f(x)=x2020,且知 f(x)在定義域上是奇函數(shù),則當(dāng) x0時(shí) ,f(x)的解析式是( ) A f(x)=x+2020 B f(x)=x+2020 C f(x)=x2020