题目内容
（1）（
+
）×15=______×______+______×______
（2）
×
+
×
=______×（______+______）
（3）（
+
）×5=______+______
（4）100×
=（99+1）×
=______+______=______．
| 3 |
| 5 |
| 2 |
| 5 |
（2）
| 1 |
| 2 |
| 1 |
| 3 |
| 1 |
| 2 |
| 1 |
| 3 |
（3）（
| 1 |
| 10 |
| 1 |
| 5 |
（4）100×
| 23 |
| 99 |
| 23 |
| 99 |
（1）（
| 3 |
| 5 |
| 2 |
| 5 |
=
| 3 |
| 5 |
| 2 |
| 5 |
=9+6，
=15；
（2）
| 1 |
| 2 |
| 1 |
| 3 |
| 1 |
| 2 |
| 1 |
| 3 |
=
| 1 |
| 3 |
| 1 |
| 2 |
| 1 |
| 2 |
=
| 1 |
| 3 |
=
| 1 |
| 3 |
（3）（
| 1 |
| 10 |
| 1 |
| 5 |
=
| 1 |
| 10 |
| 1 |
| 5 |
=
| 1 |
| 2 |
=1
| 1 |
| 2 |
（4）100×
| 23 |
| 99 |
=（99+1）×
| 23 |
| 99 |
=99×
| 23 |
| 99 |
| 23 |
| 99 |
=23+
| 23 |
| 99 |
=23
| 23 |
| 99 |
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