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> 先化简,再求值:(2a-1-1a+1)×(a2-1),其中a=3-3.-数学
先化简,再求值:(2a-1-1a+1)×(a2-1),其中a=3-3.-数学
题目简介
先化简,再求值:(2a-1-1a+1)×(a2-1),其中a=3-3.-数学
题目详情
先化简,再求值:
(
2
a-1
-
1
a+1
)×(a
2
-1),其中a=
3
-3.
题型:解答题
难度:中档
来源:宁夏
答案
(
class="stub"2
a-1
-
class="stub"1
a+1
)×(a2-1)
=
2(a+1)-(a-1)
(a+1)(a-1)
×(a+1)(a-1)=a+3;
当a=
3
-3时,
原式=
3
-3+3=
3
.
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题目简介
先化简,再求值:(2a-1-1a+1)×(a2-1),其中a=3-3.-数学
题目详情
答案
=
当a=
原式=