题目内容
化简:a
-2a2
+3
(a>0).
| 8a |
|
| 2a3 |
a
-2a2
+3
=a•2
-2a2•
+3•a
=2a
-
+3a
=
.
| 8a |
|
| 2a3 |
=a•2
| 2a |
| ||
| 4a |
| 2a |
=2a
| 2a |
| a |
| 2 |
| 2a |
| 2a |
=
| 9a |
| 2 |
| 2a |
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题目内容
| 8a |
|
| 2a3 |
| 8a |
|
| 2a3 |
| 2a |
| ||
| 4a |
| 2a |
| 2a |
| a |
| 2 |
| 2a |
| 2a |
| 9a |
| 2 |
| 2a |