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> 先化简,再求值:1a+2-44-a2,其中a=4+3.-数学
先化简,再求值:1a+2-44-a2,其中a=4+3.-数学
题目简介
先化简,再求值:1a+2-44-a2,其中a=4+3.-数学
题目详情
先化简,再求值:
1
a+2
-
4
4-
a
2
,其中a=4+
3
.
题型:解答题
难度:中档
来源:扬州
答案
原式=
class="stub"a-2+4
(a+2)(a-2)
=
class="stub"1
a-2
;
当a=4+
3
时,原式=
class="stub"1
4+
3
-2
=2-
3
.
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题目简介
先化简,再求值:1a+2-44-a2,其中a=4+3.-数学
题目详情
答案
当a=4+