题干
简算
①9
－（3
＋0.4）
| 2 |
| 5 |
| 3 |
| 7 |
②1.8×
＋2.2×25％
| 1 |
| 4 |
③
+
+
+⋯+
+
| 1 |
| 1 |
| × |
| 3 |
| 1 |
| 3 |
| × |
| 5 |
| 1 |
| 5 |
| × |
| 7 |
| 1 |
| × |
| 1 |
| × |
答案(点此获取答案解析）
解：
9
-(3
+0.4)
=9
9
| 2 |
| 5 |
| 3 |
| 7 |
=9
