题目内容
105×（
+
-
）
| 2 |
| 3 |
| 1 |
| 5 |
| 4 |
| 7 |
105×（
+
-
），
=105×
+105×
-105×
，
=70+21-60，
=91-60，
=31．
| 2 |
| 3 |
| 1 |
| 5 |
| 4 |
| 7 |
=105×
| 2 |
| 3 |
| 1 |
| 5 |
| 4 |
| 7 |
=70+21-60，
=91-60，
=31．
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