When the straight line passes through the origin, the secant length is the largest. At this time, the equation is y=x, and the positive and negative roots of x2 = 4/3 and x = 4/3 are calculated by combining the elliptic equation. At that time, the square of the length of AB is 2|X| (this is the distance between two solutions), and the square of AB =32/3 AB is greater than 9 and less than 16, then AB is greater than 3 and less than 4. If it can be taken as 3, then the secant is at least 0 and can be tangent. Then you can get the length of 1, 2, 3. Because of symmetry, there are six * * *.