3. 已知
( ) ( )
115 5 4 2 115
0 1 2 115 f x x x x a a x a x a x = + − − = + + + + 3 2 4 2 ...

57
2
0
k
k
p a
=
=  , ( )
57
2
0
1
k
k
k
q a
=
= −  ,
28
4 1
0
k
k
r a +
=
= ,
28
4 3
0
k
k
s a +
=
= 
,試求數對
( p q r s , , , )。(8 分)