A、<img width="81" height="24" id="图片 239" src="https://static.tiw.cn//s/tiw/p3/UpLoadImage/2016-08-09/ba564425-478c-40ba-a258-d6e1038f3144.png">
B、<img width="67" height="22" id="图片 238" src="https://static.tiw.cn//s/tiw/p3/UpLoadImage/2016-08-09/46009e8f-101c-44c8-9376-18867db29ab9.png">
C、<img width="98" height="42" id="图片 237" src="https://static.tiw.cn//s/tiw/p3/UpLoadImage/2016-08-09/ff24b459-fefb-435e-980b-792fdd38d657.png">
D、<img width="94" height="44" id="图片 236" src="https://static.tiw.cn//s/tiw/p3/UpLoadImage/2016-08-09/631e5e00-e414-491a-a497-6fe55d076613.png">
A、<img width="68" height="20" id="图片 239" src="https://static.tiw.cn//s/tiw/p3/UpLoadImage/2016-09-01/c0295170-d587-497c-90ef-07f95b9698ba.png">
B、<img width="69" height="22" id="图片 238" src="https://static.tiw.cn//s/tiw/p3/UpLoadImage/2016-09-01/d323ff1a-a7b7-4e91-b841-66a0d26ccaa8.png">
C、<img width="85" height="37" id="图片 237" src="https://static.tiw.cn//s/tiw/p3/UpLoadImage/2016-09-01/d255387c-9eb4-4250-867a-9dfeb845427e.png">
D、<img width="83" height="39" id="图片 236" src="https://static.tiw.cn//s/tiw/p3/UpLoadImage/2016-09-01/da11d994-d320-4532-9a5b-fa29ea64dcfa.png">
A、<img width="68" height="20" id="图片 946" src="https://static.tiw.cn//s/tiw/p3/UpLoadImage/2013-05-07/77da70e0-5e3f-4638-8c5c-44cae26c8b8c.jpg">
B、<img width="69" height="22" id="图片 945" src="https://static.tiw.cn//s/tiw/p3/UpLoadImage/2013-05-07/02ac71ee-4eca-4ad8-8610-6d9e24bc8853.jpg">
C、<img width="107" height="47" id="图片 944" src="https://static.tiw.cn//s/tiw/p3/UpLoadImage/2013-05-07/f0543c82-1d25-4628-a9a1-90b58899b990.jpg">
D、<img width="107" height="50" id="图片 943" src="https://static.tiw.cn//s/tiw/p3/UpLoadImage/2013-05-07/f1cb3ad5-474b-4dc0-bcb3-dafb2f9d0e7d.jpg">
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试题解析
AB两项，函数的定义域为R；C项，函数的定义域为R且x≠0；D项，函数的定义域为R且x≠2．
