若直线3x+4y-12=0与x轴交点A,与y轴交于点B,O是坐标原点,那么△OAB内切于圆的方程是( )
A.x2+y2+2x+2y+1="0" | B.x2+y2-2x+2y+1="0" | C.x2+y2-2x-2y+1="0" | D.x2+y2-2x-2y-1=0 |
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若直线3x+4y-12=0与x轴交点A,与y轴交于点B,O是坐标原点,那么△OAB内切于圆的方程是( )
A.x2+y2+2x+2y+1="0" | B.x2+y2-2x+2y+1="0" | C.x2+y2-2x-2y+1="0" | D.x2+y2-2x-2y-1=0 |