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> 先化简,再求值:(a+1a2-a-aa2-2a+1)÷1a,其中a=3+1.-数学
先化简,再求值:(a+1a2-a-aa2-2a+1)÷1a,其中a=3+1.-数学
题目简介
先化简,再求值:(a+1a2-a-aa2-2a+1)÷1a,其中a=3+1.-数学
题目详情
先化简,再求值:
(
a+1
a
2
-a
-
a
a
2
-2a+1
)÷
1
a
,其中
a=
3
+1
.
题型:解答题
难度:中档
来源:不详
答案
原式=
[
class="stub"a+1
a(a-1)
-
class="stub"a
(a-1)
2
]×a
l分
=
class="stub"a+1
a(a-1)
×a-
a
2
(a-1)
2
=
(a+1)(a-1)
(a-1)
2
-
a
2
(a-1)
2
(3分)
=
a
2
-1-
a
2
(a-1)
2
=-
class="stub"1
(a-1)
2
(4分)
当
a=
3
+1
时,原式=
-
class="stub"1
(
3
+1-1)
2
=-
class="stub"1
3
(6分)
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题目简介
先化简,再求值:(a+1a2-a-aa2-2a+1)÷1a,其中a=3+1.-数学
题目详情
答案
=
=
当a=