题目内容
计算:
(1)
-2cos30°+(
)-2-|1-
|
(2)
-a+1.
(1)
| 27 |
| 1 |
| 2 |
| 3 |
(2)
| a2 |
| a+1 |
(1)
-2cos30°+(
)-2-|1-
|
=3
-2×
+4-(
-1)
=
+5;
(2)
-a+1
=
-
=
.
| 27 |
| 1 |
| 2 |
| 3 |
=3
| 3 |
| ||
| 2 |
| 3 |
=
| 3 |
(2)
| a2 |
| a+1 |
=
| a2 |
| a+1 |
| (a-1)(a+1) |
| a+1 |
=
| 1 |
| a+1 |
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