题目内容
计算:
(1)
-
+
+sin30°
(2)[
+1]•
.
(1)
| 8 |
| 3 | 64 |
|
(2)[
| (a+b)2 |
| a2-b2 |
| 1 |
| 2a |
(1)原式=2
-4+9-2
+
=5
;
(2)原式=
•
=
•
=
.
| 2 |
| 2 |
| 1 |
| 2 |
=5
| 1 |
| 2 |
(2)原式=
| (a+b)2+a2-b2 |
| a2-b2 |
| 1 |
| 2a |
=
| 2a2+2ab |
| a2-b2 |
| 1 |
| 2a |
=
| 1 |
| a-b |
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