(1)计算:sin60°-|1-3|+(12)-1(2)化简:(a+3)2-(a-3)2.-数学

题目简介

(1)计算:sin60°-|1-3|+(12)-1(2)化简:(a+3)2-(a-3)2.-数学

题目详情

(1)计算:sin60°-|1-
3
|+(
1
2
)
-1
(2)化简:(a+3)2-(a-3)2
题型:解答题难度:中档来源:赤峰

答案

(1)原式=
3
2
-(
3
-1)+2
=
3
2
-
3
+1+2
=-
3
2
+3;

(2)原式=a2+6a+9-(a2-6a+9)
=a2+6a+9-a2+6a-9
=12a.

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