问题
解答题
先化简,再求值
|
答案
原式=
•x+3 (x+1)(x-1)
+(x-1)2 (x+3)(x-1) 1 x+1
=
+1 x+1 1 x+1
=
.2 x+1
当x=2
-1时,原式=3
=2 2
-1+13
.3 3
先化简,再求值
|
原式=
•x+3 (x+1)(x-1)
+(x-1)2 (x+3)(x-1) 1 x+1
=
+1 x+1 1 x+1
=
.2 x+1
当x=2
-1时,原式=3
=2 2
-1+13
.3 3