问题
解答题
请你先化简分式
|
答案
÷x+3 x2-1
+x2+6x+9 x2-2x+1 1 x+1
=
•x+3 (x+1)(x-1)
+(x-1)2 (x+3)2 1 x+1
=
•1 x+1
+x-1 x+3 1 x+1
=
(1 x+1
+1)x-1 x+3
=
•1 x+1 2(x+1) x+3
=
,2 x+3
∵x2-1≠0,x+3≠0,x-1≠0,x+1≠0,
∴取x=2,
代入得:原式=
=2 2+3
.2 5