题目内容
[
-(
+
)]÷
.
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| 2 |
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| 1 |
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| 4 |
| 5 |
[
-(
+
)]÷
,
=[
-
]÷
,
=
×
,
=
.
| 17 |
| 20 |
| 2 |
| 5 |
| 1 |
| 4 |
| 4 |
| 5 |
=[
| 17 |
| 20 |
| 13 |
| 20 |
| 4 |
| 5 |
=
| 1 |
| 5 |
| 5 |
| 4 |
=
| 1 |
| 4 |
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