∴b=0
Let the equation of a circle be (x-a). +y？ =r？ (where a > 0)
Circumscribe with a circle m
∴|a- 1|= 1+r (the center of circle m is (1, 0) and the radius is 1, so the distance between two centers is equal to the sum of the radii of two circles).
∫ The straight line x+√3y=0 is tangent.
∴d=|a|/2=r，a=4 r=2。
The equation of circle c is (x-4)? +y？ =4
The country is rich and strong, and the people are duty-bound. We should all open our eyes and guide the people to the light.
It makes