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> (1)计算:-12012+(12)-2-(tan62°+2π)0+|27-8sin60°|,(2)先化简,再求值:(a2-5a+2a+2+1)•a2-4a2+4a+4,其中,a=2+3.-数学
(1)计算:-12012+(12)-2-(tan62°+2π)0+|27-8sin60°|,(2)先化简,再求值:(a2-5a+2a+2+1)•a2-4a2+4a+4,其中,a=2+3.-数学
题目简介
(1)计算:-12012+(12)-2-(tan62°+2π)0+|27-8sin60°|,(2)先化简,再求值:(a2-5a+2a+2+1)•a2-4a2+4a+4,其中,a=2+3.-数学
题目详情
(1)计算:
-1
2012
+
(
1
2
)
-2
-
(tan62°+
2
π
)
0
+|
27
-8sin60°|
,
(2)先化简,再求值:(
a
2
-5a+2
a+2
+1
)•
a
2
-4
a
2
+4a+4
,其中,a=2+
3
.
题型:解答题
难度:中档
来源:海门市一模
答案
(1)原式=-1+4-1+|3
3
-8×
3
2
|
=-1+4-1+
3
=2+
3
;
(2)原式=
a
2
-5a+2+a+2
a+2
•
(a+2)
2
(a+2)(a-2)
=
(a-2)
2
a+2
•
(a+2)
2
(a+2)(a-2)
=a-2,
当
a=2+
3
时,原式=
2+
3
-2=
3
.
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题目简介
(1)计算:-12012+(12)-2-(tan62°+2π)0+|27-8sin60°|,(2)先化简,再求值:(a2-5a+2a+2+1)•a2-4a2+4a+4,其中,a=2+3.-数学
题目详情
(2)先化简,再求值:(
答案
=-1+4-1+
=2+
(2)原式=
=
=a-2,
当a=2+