(2)? Through equations? , eliminate the equation of y? ,

Because of the straight line? Cross ellipse? Yu? 、? At two o'clock,

So what? & gt0, that is? ,

Let C(x 1, y 1) and D(x2, y2), and the midpoint coordinate of CD is (x0, y0).

then what ,

Through equations? , eliminate the y equation (k2? k 1)x？ p，

Because again? , so? ,

So e is the midpoint of CD;

(3)? Steps to find points P 1 and P2: 1? Find the midpoint of PQ? ,

2? Find the slope of the straight line OE? ,

3? By who? Knowing that e is the midpoint of CD, can you find the slope of CD according to (2)? ,

4? Thus the equation of straight line CD is obtained:? ,

5? The equations of straight line CD and ellipse γ are simultaneous, and the solution of the equations is the coordinates of point P 1 and P2.

For the existence of P 1 and P2, the point e must be within the ellipse.

So what? , simplified? ,? ,

Another 0

So what is the value range? .