问题
解答题
先化简，再求值(
|
答案
(
-3 x-1
)•1 x+1 x2-1 x
=
•3x+3-x+1 x2-1 x2-1 x
=
；2x+4 x
当x=
时，原式=2
=2+22
+42 2
．2
搜题请搜索小程序“爱下问搜题”
先化简，再求值(
|
(
-3 x-1
)•1 x+1 x2-1 x
=
•3x+3-x+1 x2-1 x2-1 x
=
；2x+4 x
当x=
时，原式=2
=2+22
+42 2
．2