题目内容
(
-
-
)×(-60).
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(
-
-
)×(-60)
=
×(-60)-
×(-60)-
×(-60)
=-40+5+16
=-40+21
=-19.
| 2 |
| 3 |
| 1 |
| 12 |
| 4 |
| 15 |
=
| 2 |
| 3 |
| 1 |
| 12 |
| 4 |
| 15 |
=-40+5+16
=-40+21
=-19.
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