题目内容
用简便方法计算:
36×(
+
-
)
36×(
| 2 |
| 9 |
| 7 |
| 12 |
| 1 |
| 4 |
36×(
+
-
),
=36×
+36×
-36×
,
=8+21-9,
=20.
| 2 |
| 9 |
| 7 |
| 12 |
| 1 |
| 4 |
=36×
| 2 |
| 9 |
| 7 |
| 12 |
| 1 |
| 4 |
=8+21-9,
=20.
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| 2 |
| 9 |
| 7 |
| 12 |
| 1 |
| 4 |
| 2 |
| 9 |
| 7 |
| 12 |
| 1 |
| 4 |
| 2 |
| 9 |
| 7 |
| 12 |
| 1 |
| 4 |