题目内容
(
+
-
)×30.
| 1 |
| 6 |
| 7 |
| 10 |
| 4 |
| 15 |
(
+
-
)×30
=
×30+
×30-
×30
=5+21-8
=18.
| 1 |
| 6 |
| 7 |
| 10 |
| 4 |
| 15 |
=
| 1 |
| 6 |
| 7 |
| 10 |
| 4 |
| 15 |
=5+21-8
=18.
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