急求求解高一必修二圆的练习题…如图第三和第四题…求过程…只要第三和第四题…
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2015-01-04
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3、设圆C方程为(x-a)^2+(y-b)^2=r^2,由题可知
a - 2b -1 = 0 --------------(1)
a^2 + b^2 = r^2------------(2)
(2-a)^2+(1-b)^2 = r^2------(3)
(1)-(3)联立解得: a = 6/5, b = 1/10, r = 根号145/10
4、设圆C方程为(x-a)^2+(y-b)^2= r^2,
有 b = 0 -------------(1)
(-1-a)^2 + 1 = r^2 ------------(2)
(1-a)^2 + 9 = r^2-----------(3)
得a = 2 , b = 0, r = 根号10
a - 2b -1 = 0 --------------(1)
a^2 + b^2 = r^2------------(2)
(2-a)^2+(1-b)^2 = r^2------(3)
(1)-(3)联立解得: a = 6/5, b = 1/10, r = 根号145/10
4、设圆C方程为(x-a)^2+(y-b)^2= r^2,
有 b = 0 -------------(1)
(-1-a)^2 + 1 = r^2 ------------(2)
(1-a)^2 + 9 = r^2-----------(3)
得a = 2 , b = 0, r = 根号10
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