Current location - Training Enrollment Network - Mathematics courses - ? Senior high school mathematics compulsory two-choice question "the position relationship between straight line and circle" 34 1?
? Senior high school mathematics compulsory two-choice question "the position relationship between straight line and circle" 34 1?
Substitute x= 1-y into x 2+y 2-2ay = 0.
Get 2y 2-2 (1+a) y+1= 0.
Because there is no common * * * point, △ = (2 (1+a)) 2-4 * 2 < 0, and condition a > 0.