题目内容
简便计算
×
+
×
+
×
×15×9
（
-
）×18．
| 5 |
| 8 |
| 3 |
| 4 |
| 1 |
| 4 |
| 5 |
| 8 |
| 5 |
| 8 |
| 14 |
| 15 |
| 2 |
| 9 |
（
| 8 |
| 9 |
| 5 |
| 6 |
①
×
+
×
+
=
×（
+
+1）
=
×2
=1
；
②
×
×15×9
=（
×15）×（
×9）
=14×2
=28；
③（
-
）×18
=
×18-
×18
=16-15
=1．
| 5 |
| 8 |
| 3 |
| 4 |
| 1 |
| 4 |
| 5 |
| 8 |
| 5 |
| 8 |
=
| 5 |
| 8 |
| 3 |
| 4 |
| 1 |
| 4 |
=
| 5 |
| 8 |
=1
| 1 |
| 4 |
②
| 14 |
| 15 |
| 2 |
| 9 |
=（
| 14 |
| 15 |
| 2 |
| 9 |
=14×2
=28；
③（
| 8 |
| 9 |
| 5 |
| 6 |
=
| 8 |
| 9 |
| 5 |
| 6 |
=16-15
=1．
练习册系列答案
每日10分钟口算心算速算天天练系列答案
相关题目