判定圆x2+y2-6x+4y+12=0与圆x2+y2-14x-2y+14=0是否相切.
判定圆x2+y2-6x+4y+12=0与圆x2+y2-14x-2y+14=0是否相切.
实数k为何值时,两圆C1:X2+Y2+4X-6Y+12=0,C2:X2+Y2-2X-14Y+K=0
已知圆M:x2+y2-4x-8y+m=0与x轴相切.
求圆x2+y2+2x-6y+1=0与圆x2+y2+2y-..
求半径为4,与圆x2+y2-4x-2y-4=0相切,且和直线y=0相切的圆的方程.
求与圆x2+y2-2x+4y+1=0同心,且与直线2x-y+1=0相切的圆的方程.
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______.
直线3x+4y+c=0与圆x2+y2-6x-2y=0相切,则c=
圆A:x2+y2+4x+2y+1=0与圆B:x2+y2-2x-6y+1=0的位置关系是( )
c1:x2+y2-2x-6y-6=0,与圆c2:x2+y2-4x+2y+4=0的公切线的条数.
两圆x2+y2-4x+2y+1=0与x2+y2+4x-4y-1=0的公切线有______条.
已知两圆x2+y2-10x-10y=0,x2+y2+6x-2y-40=0,