问题
解答题
(1)化简,求值:
(2)
|
答案
(1)原式=
+x+3 (x-3)(x+3) 3 x-3
=
+1 x-3 3 x-3
=
.4 x-3
当x=-1时,原式=
=-1.4 -1-3
(2)原式=
=a2-1 a+1 (a-1)(a+1) a+1
=a-1.
(1)化简,求值:
(2)
|
(1)原式=
+x+3 (x-3)(x+3) 3 x-3
=
+1 x-3 3 x-3
=
.4 x-3
当x=-1时,原式=
=-1.4 -1-3
(2)原式=
=a2-1 a+1 (a-1)(a+1) a+1
=a-1.