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> 先化简再求值:(3x-1-1x+1)÷xx2-1,其中x=12.-数学
先化简再求值:(3x-1-1x+1)÷xx2-1,其中x=12.-数学
题目简介
先化简再求值:(3x-1-1x+1)÷xx2-1,其中x=12.-数学
题目详情
先化简再求值:
(
3
x-1
-
1
x+1
)÷
x
x
2
-1
,其中
x=
1
2
.
题型:解答题
难度:中档
来源:不详
答案
原式=
3(x+1)-(x-1)
(x-1)(x+1)
÷
class="stub"x
(x+1)(x-1)
=
class="stub"2x+4
(x-1)(x+1)
•
(x+1)(x-1)
x
=
class="stub"2x+4
x
当
x=
class="stub"1
2
时,原式=10.
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题目简介
先化简再求值:(3x-1-1x+1)÷xx2-1,其中x=12.-数学
题目详情
答案
=
=
当x=