题目内容
（-
-
+
）×48．
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（-
-
+
）×48，
=-
×48-
×48+
×48，
=-12-18+10，
=-30+10，
=-20．
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=-
| 1 |
| 4 |
| 3 |
| 8 |
| 5 |
| 24 |
=-12-18+10，
=-30+10，
=-20．
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