题目内容
(1)计算:sin60°-|1-
|+(
)-1
(2)化简:(a+3)2-(a-3)2.
| 3 |
| 1 |
| 2 |
(2)化简:(a+3)2-(a-3)2.
(1)原式=
-(
-1)+2
=
-
+1+2
=-
+3;
(2)原式=a2+6a+9-(a2-6a+9)
=a2+6a+9-a2+6a-9
=12a.
| ||
| 2 |
| 3 |
=
| ||
| 2 |
| 3 |
=-
| ||
| 2 |
(2)原式=a2+6a+9-(a2-6a+9)
=a2+6a+9-a2+6a-9
=12a.
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