一道高中数学题急求解答谢谢!是中间那道阿求过程!!
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L1:x-3y=0
x=3y
设C(3c,c)
与y轴相切:半径r=3c
圆C方程:(x-3c)^2+(y-c)^2=9c^2
L2: x-y=0
y=x
(x-3c)^2+(x-c)^2=9c^2
x^2-6cx+9c^2+x^2-2cx+c^2=9c^2
2x^2-8cx+c^2=0
x1+x2=4c
x1x2=c^2/2
(x1-x2)^2=(x1+x2)^2-4x1x2
=16c^2-2c^2
=14c^2
(y1-y2)^2=(x1-x2)^2
=14c^2
√((x1-x2)^2+(y1-y2)^2)=2√7
14c^2+14c^2=28
c^2=1
c=±1
圆C方程:(x+3)^2+(y+1)^2=9
或者(x-3)^2+(y-1)^2=9
x=3y
设C(3c,c)
与y轴相切:半径r=3c
圆C方程:(x-3c)^2+(y-c)^2=9c^2
L2: x-y=0
y=x
(x-3c)^2+(x-c)^2=9c^2
x^2-6cx+9c^2+x^2-2cx+c^2=9c^2
2x^2-8cx+c^2=0
x1+x2=4c
x1x2=c^2/2
(x1-x2)^2=(x1+x2)^2-4x1x2
=16c^2-2c^2
=14c^2
(y1-y2)^2=(x1-x2)^2
=14c^2
√((x1-x2)^2+(y1-y2)^2)=2√7
14c^2+14c^2=28
c^2=1
c=±1
圆C方程:(x+3)^2+(y+1)^2=9
或者(x-3)^2+(y-1)^2=9
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