问题
解答题
若
|
答案
-A x+1 B x-1
=A(x-1)-B(x+1) (x+1)(x-1)
=(A-B)x-(A+B) x2-1
=
,x-3 x2-1
∴
,A-B=1 A+B=3
解得:
.A=2 B=1
若
|
-A x+1 B x-1
=A(x-1)-B(x+1) (x+1)(x-1)
=(A-B)x-(A+B) x2-1
=
,x-3 x2-1
∴
,A-B=1 A+B=3
解得:
.A=2 B=1