平行于直线2x+y+1=0且与圆x2+y2=5相切的直线的方程是( ) A.2x+y+5=0或

平行于直线2x+y+1=0且与圆x2+y2=5相切的直线的方程是(  )

A2x+y+5=02x+y5=0  B2x+y+=02x+y=0

C2xy+5=02xy5=0 D2xy+=02xy=0

答案

A

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