A、<img width="41" height="17" src="https://static.tiw.cn//s/tiw/p3/UpLoadImage/2016-09-01/01c959b9-f0f5-4ba6-8ee7-f523ff610c7c.png">
B、<img width="72" height="37" src="https://static.tiw.cn//s/tiw/p3/UpLoadImage/2016-09-01/f90d81da-8773-4e7d-933b-37f250a18b46.png">
C、<img width="76" height="35" src="https://static.tiw.cn//s/tiw/p3/UpLoadImage/2016-09-01/d435b9c8-8c30-4ace-affd-38c66bd3ce5d.png">
D、<img width="58" height="35" src="https://static.tiw.cn//s/tiw/p3/UpLoadImage/2016-09-01/d1e77f4a-1f30-478f-8180-8b38aebc0e31.png">
A、<img width="42" height="18" src="https://static.tiw.cn//s/tiw/p3/UpLoadImage/2016-08-09/992e53ee-ded1-46ed-b9b8-dbbb46660852.png">
B、<img width="70" height="35" src="https://static.tiw.cn//s/tiw/p3/UpLoadImage/2016-08-09/7391b620-9b55-4e92-8eb0-ff5eb7dc6100.png">
C、<img width="72" height="30" src="https://static.tiw.cn//s/tiw/p3/UpLoadImage/2016-08-09/e446462e-c100-4b59-ad64-7a3ad9dd2878.png">
D、<img width="51" height="30" src="https://static.tiw.cn//s/tiw/p3/UpLoadImage/2016-08-09/3cf87753-46b1-4264-921f-157c3c97c36c.png">
A、<img width="48" height="26" id="图片 149" src="https://static.tiw.cn//s/tiw/p3/UpLoadImage/2013-05-07/096121c9-3421-4051-9815-5541e99b060d.png">
B、<img width="87" height="42" id="图片 148" src="https://static.tiw.cn//s/tiw/p3/UpLoadImage/2013-05-07/d2435047-bbb6-4bc9-ae44-865101fedc78.png">
C、<img width="88" height="45" id="图片 147" src="https://static.tiw.cn//s/tiw/p3/UpLoadImage/2013-05-07/0017f09d-d074-455e-ba2a-f1377c2f1254.png">
D、<img width="60" height="44" id="图片 146" src="https://static.tiw.cn//s/tiw/p3/UpLoadImage/2013-05-07/d140f206-58d4-493e-9888-452525075a43.png">
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正确答案
试题解析
BC的方程为x+y=1,由
消去x,得
当a>0时,直线y=ax+b与x轴交于点
.结合图形知
化简得
,则
,解得
.
考虑极限位置,即a=0,此时易得
.