题目内容
(1)计算:-22+(-3)2+sin30°+|1-
|+(3.14-π)0
(2)计算:
+a-2.
| 3 |
(2)计算:
| 4 |
| a+2 |
(1)原式=-4+9+
+
-1+1,
=5
+
;
(2)原式=
+
=
+
,
=
.
| 1 |
| 2 |
| 3 |
=5
| 1 |
| 2 |
| 3 |
(2)原式=
| 4 |
| a+2 |
| a-2 |
| 1 |
=
| 4 |
| a+2 |
| a2-4 |
| a+2 |
=
| a2 |
| a+2 |
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