Question

函數(shù)的圖像大致為                                           (      ).

Answer 1

A

解析： 函數(shù)有意義,需使,其定義域?yàn)?IMG src='http://thumb.zyjl.cn/pic1/img/20091017/20091017084132002.gif' width=65 height=23>,排除C,D,又因?yàn)?IMG src='http://thumb.zyjl.cn/pic1/img/20091017/20091017084133003.gif' width=213 height=44>,所以當(dāng)時(shí)函數(shù)為減函數(shù),故選A.      

【命題立意】:本題考查了函數(shù)的圖象以及函數(shù)的定義域、值域、單調(diào)性等性質(zhì).本題的難點(diǎn)在于給出的函數(shù)比較復(fù)雜,需要對(duì)其先變形,再在定義域內(nèi)對(duì)其進(jìn)行考察其余的性質(zhì).