题目内容
(1)求|1+lg0.001|+
+lg6-lg0.02的值;(2)已知a
+a-
=3,求a
+a-
的值.
| (lg3)2-4lg3+4 |
| 1 |
| 2 |
| 1 |
| 2 |
| 3 |
| 2 |
| 3 |
| 2 |
(1)|1+lg0.001|+
+lg6-lg0.02
=|1-3|+|lg3-2|+lg300
=2+2-lg3+lg3+2
=6
(1)a
+a-
=(a
+a-
)[(a
+a-
)2-3]
=18
| (lg3)2-4lg3+4 |
=|1-3|+|lg3-2|+lg300
=2+2-lg3+lg3+2
=6
(1)a
| 3 |
| 2 |
| 3 |
| 2 |
=(a
| 1 |
| 2 |
| 1 |
| 2 |
| 1 |
| 2 |
| 1 |
| 2 |
=18
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