题目内容
3+
+
=3+(
+
)此题运用了加法的______律.
| 7 |
| 12 |
| 5 |
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3+
+
,
=3+(
+
),
=3+1,
=4;
所以此题运用了加法结合律.
故答案为:结合.
| 7 |
| 12 |
| 5 |
| 12 |
=3+(
| 7 |
| 12 |
| 5 |
| 12 |
=3+1,
=4;
所以此题运用了加法结合律.
故答案为:结合.
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题目内容
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