题干
（1﹣
+
）×（﹣24）．
| 3 |
| 8 |
| 7 |
答案(点此获取答案解析）
解：原式=﹣24+
x24﹣
x24
| 3 |
| 8 |
| 7 |
=﹣24
| 3 |
| 8 |
| 7 |
| 3 |
| 8 |
| 7 |
