问题
解答题
先化简，再求值：(
|
答案
(
+3x2 x2-1
)÷2x 1-x x x-1
=[
-3x2 (x+1)((x-1)
]•2x(x+1) (x+1)(x-1) x-1 x
=
•x(3x-2x-2) (x+1)(x-1) x-1 x
=
，x-2 x+1
当x=
-1时，3
原式=
=1-
-1-23
-1+13
．3
搜题请搜索小程序“爱下问搜题”
先化简，再求值：(
|
(
+3x2 x2-1
)÷2x 1-x x x-1
=[
-3x2 (x+1)((x-1)
]•2x(x+1) (x+1)(x-1) x-1 x
=
•x(3x-2x-2) (x+1)(x-1) x-1 x
=
，x-2 x+1
当x=
-1时，3
原式=
=1-
-1-23
-1+13
．3