3 |
4 |
1 |
x |
{ | f(a)=-a3=b f(b)=-b3=a. |
b |
a |
-a3 |
-b3 |
a |
b |
a |
b |
a |
b |
{ | a=-1 b=1 |
3 |
4 |
1 |
x2 |
3 |
4 |
1 |
x2 |
2 √3 |
3 |
2 √3 |
3 |
2 √3 |
3 |
3 |
4 |
1 |
x2 |
2 √3 |
3 |
2 √3 |
3 |
{ | ?(a)=k+ √a+2 =a?(b)=k+ √b+2 =b. |
{ | x2-(2k+1)x+(k2-2)=0 x≥-2 x≥k |
{ |
△=(2k+1)2-4(k2-2)>0 (-2)2-(2k+1)(-2)+(k2-2)≥0. |
9 |
4 |
{ |
△=(2k+1)2-4(k2-2)>0 k2-(2k+1)k+(k2-2)≥0. |
9 |
4 |
9 |
4 |