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> 先化简后求值:(1+1a-1)÷(aa2-1-aa+1),其中a=14.-数学
先化简后求值:(1+1a-1)÷(aa2-1-aa+1),其中a=14.-数学
题目简介
先化简后求值:(1+1a-1)÷(aa2-1-aa+1),其中a=14.-数学
题目详情
先化简后求值:(1+
1
a-1
)÷(
a
a
2
-1
-
a
a+1
),其中a=
1
4
.
题型:解答题
难度:中档
来源:不详
答案
原式=
class="stub"a-1+1
a-1
÷
a-a(a-1)
(a+1)(a-1)
=
class="stub"a
a-1
•
(a+1)(a-1)
-a(a-2)
=
class="stub"a+1
2-a
,
当a=
class="stub"1
4
时,原式=
class="stub"1
4
+1
2-
class="stub"1
4
=
class="stub"5
7
.
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题目简介
先化简后求值:(1+1a-1)÷(aa2-1-aa+1),其中a=14.-数学
题目详情
答案
当a=