题目内容
（
+
）×4=
×4+
×4应用了______律．
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| 4 |
（
+
）×4
=
×4+
×4 （运用了乘法分配律）
=
+1
=1
；
故答案为：乘法分配．
| 1 |
| 10 |
| 1 |
| 4 |
=
| 1 |
| 10 |
| 1 |
| 4 |
=
| 2 |
| 5 |
=1
| 2 |
| 5 |
故答案为：乘法分配．
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