- 问题详情:与直线l:y=2x+3平行,且与圆x2+y2-2x-4y+4=0相切的直线方程是( )A.x-y±=0B.2x-y+=0 C.2x-y-=0 D.2x-y±=0【回答】D知识点:圆与方程题型:选择题...
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- 问题详情:与直线l:y=2x+3平行,且与圆x2+y2-2x-4y+4=0相切的直线方程是( ).A.x-y±=0 B.2x-y+=0C.2x-y-=0 D.2x-y±=0【回答】D解析:设所求直线方程为y=2x+b,即2x-y+b=0.圆x2+y2—2x—4y+4=0的标准方程为(...
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