令Y/X=K(K为常数,K>0),则Y=KX,代入圆方程得:
X^2-6X+9+K^2X^2-6KX+9=6,
(K^2+1)X^2-6(K+1)X+12=0,
Δ=36(K+1)^2-48(K^2+1)
=-12K^2+72K-12
=-12(K^2-6K+9-8)
=-12(K-3)^2+96≥0,
|K-3|≤2√2,
∴0
令Y/X=K(K为常数,K>0),则Y=KX,代入圆方程得:
X^2-6X+9+K^2X^2-6KX+9=6,
(K^2+1)X^2-6(K+1)X+12=0,
Δ=36(K+1)^2-48(K^2+1)
=-12K^2+72K-12
=-12(K^2-6K+9-8)
=-12(K-3)^2+96≥0,
|K-3|≤2√2,
∴0