题目内容
化简或计算:
(1)
+
-
(2)|
-
|+
(结果保留三位有效数字)
(1)
| 3 | -0.001 |
2
|
| (-2)2 |
(2)|
| 2 |
| 3 |
| 2 |
(1)
+
-
=
+
-|-2|
=-0.1+
-2
=[-0.1)+(-2)]+1.5
=(-2.1)+1.5
=-0.6;
(2)∵
-
<0,
∴|
-
|+
=
-
+
=
≈1.73.
| 3 | -0.001 |
2
|
| (-2)2 |
=
| 3 | (-0.1)3 |
(
|
=-0.1+
| 3 |
| 2 |
=[-0.1)+(-2)]+1.5
=(-2.1)+1.5
=-0.6;
(2)∵
| 2 |
| 3 |
∴|
| 2 |
| 3 |
| 2 |
| 3 |
| 2 |
| 2 |
| 3 |
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