k值

扩展方向

k值

扩展方向

(−1/3, 1/3), $F_x\ge 0$

1

(−1/3, 1/3), $F_x<0$

5

[1/3, 3], $F_x\ge 0$

2

[1/3, 3], $F_x<0$

6

(3, +∞) ∪ (−∞, −3), $F_y\ge 0$

3

(3, +∞) ∪ (−∞, −3), $F_y<0$

7

(−3, −1/3), $F_x<0$

4

(−3, −1/3), $F_x\ge 0$

8