题目内容
(2
-4
-1
)×(-
)
| 1 |
| 4 |
| 1 |
| 2 |
| 1 |
| 8 |
| 8 |
| 9 |
(2
-4
-1
)×(-
),
=2
×(-
)-4
×(-
)-1
×(-
)
=-2+4+1
=-2+5
=3.
| 1 |
| 4 |
| 1 |
| 2 |
| 1 |
| 8 |
| 8 |
| 9 |
=2
| 1 |
| 4 |
| 8 |
| 9 |
| 1 |
| 2 |
| 8 |
| 9 |
| 1 |
| 8 |
| 8 |
| 9 |
=-2+4+1
=-2+5
=3.
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