(1)计算:(-12)-1-21+(1-2)0+4sin60°;(2)化简:(1+4a2-4)•a+2a.-数学

题目简介

(1)计算:(-12)-1-21+(1-2)0+4sin60°;(2)化简:(1+4a2-4)•a+2a.-数学

题目详情

(1)计算:(-
1
2
-1-
21
+(1-
2
0+4sin60°;
(2)化简:(1+
4
a2-4
)
a+2
a
题型:解答题难度:中档来源:绍兴

答案

(1)原式=-2-
21
+1+4×
3
2

=-1-
21
+2
3


(2)原式=
a2
a2-4
•class="stub"a+2
a

=
a2
(a+2)(a-2)
•class="stub"a+2
a

=class="stub"a
a-2

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