Question

如图,直线y=3/4x+3与x轴y轴分别交于A,B两点已知点C(0,-1),D(0,k)且0

Answer 1

圆的半径r=k-(-1)=k+1,圆心(0,k),设圆心到直线的距离为d,则d=r时相切,d>r时相离
d=｜k-3｜/√(1+9/16)=(3-k)*4/5
1,d=r,
(3-k)*4/5=k+1,解得k=7/9
2,d>r
(3-k)*4/5>k+1,解得
k