问题
解答题
(1)计算:sin60°-|1-
(2)化简:(a+3)2-(a-3)2. |
答案
(1)原式=
-(3 2
-1)+23
=
-3 2
+1+23
=-
+3;3 2
(2)原式=a2+6a+9-(a2-6a+9)
=a2+6a+9-a2+6a-9
=12a.
(1)计算:sin60°-|1-
(2)化简:(a+3)2-(a-3)2. |
(1)原式=
-(3 2
-1)+23
=
-3 2
+1+23
=-
+3;3 2
(2)原式=a2+6a+9-(a2-6a+9)
=a2+6a+9-a2+6a-9
=12a.