题目内容
计算:
(1)
+
-2×
(2)(-
)-1-
+(1-
)0+
.
(1)
| 8 |
| 1 | ||
|
|
| 1 |
| 2 |
| 3 |
| 2 |
| 12 |
(1)原式=2
+
-2×
=2
+
-1-
=2
-1;
(2)原式=-2-
+1+2
=
-1.
| 2 |
| ||||
(
|
| ||
| 2 |
=2
| 2 |
| 2 |
| 2 |
=2
| 2 |
(2)原式=-2-
| 3 |
| 3 |
=
| 3 |
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