题目内容
计算：（
-1）2+
+
-（
-
）0•（cos60°）-1______．
| 3 |
| 2 | ||
|
| 12 |
| 5 |
| 3 |
原式=3-2
+1+
-1+2
-1×（
）-1
=3-2
+1+
-1+2
-2
=
+1．
故答案为
+1．
| 3 |
| 3 |
| 3 |
| 1 |
| 2 |
=3-2
| 3 |
| 3 |
| 3 |
=
| 3 |
故答案为
| 3 |
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