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> 先化简,再求值:(a-a-2a2-2a)÷a-1a,其中a=(12)-1+tan45°.-数学
先化简,再求值:(a-a-2a2-2a)÷a-1a,其中a=(12)-1+tan45°.-数学
题目简介
先化简,再求值:(a-a-2a2-2a)÷a-1a,其中a=(12)-1+tan45°.-数学
题目详情
先化简,再求值:
(a-
a-2
a
2
-2a
)÷
a-1
a
,其中
a=
(
1
2
)
-1
+tan45°
.
题型:解答题
难度:中档
来源:盘锦
答案
原式=(a-
class="stub"1
a
)•
class="stub"a
a-1
=
(a+1)(a-1)
a
•
class="stub"a
a-1
=a+1,
当a=2+1=3时,原式=3+1=4.
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题目简介
先化简,再求值:(a-a-2a2-2a)÷a-1a,其中a=(12)-1+tan45°.-数学
题目详情
答案
=
=a+1,
当a=2+1=3时,原式=3+1=4.