题目内容
(-
)2007×(2
)2006
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| 2 |
| 5 |
(-
)2007×(2
)2006,
=(-
)×(-
)2006×(
)2006,
=(-
)×(-
×
)2006,
=-
.
| 5 |
| 12 |
| 2 |
| 5 |
=(-
| 5 |
| 12 |
| 5 |
| 12 |
| 12 |
| 5 |
=(-
| 5 |
| 12 |
| 5 |
| 12 |
| 12 |
| 5 |
=-
| 5 |
| 12 |
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