题目内容
已知a=8,求2a2•
-
-
的值.
|
| 2a3 |
| a |
| 4 |
| 8a |
∵a=8>0,
∴原式=2a2•
-a
-
=2a
-a
-
=
=
=16.
∴原式=2a2•
| ||
| a |
| 2a |
| a |
| 2 |
| 2a |
=2a
| 2a |
| 2a |
| a |
| 2 |
| 2a |
=
| a |
| 2 |
| 2a |
=
| 8 |
| 2 |
| 2×8 |
=16.
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题目内容
|
| 2a3 |
| a |
| 4 |
| 8a |
| ||
| a |
| 2a |
| a |
| 2 |
| 2a |
| 2a |
| 2a |
| a |
| 2 |
| 2a |
| a |
| 2 |
| 2a |
| 8 |
| 2 |
| 2×8 |