题目内容
递等式计算，能简便的用简便方法．
×（
÷
）
87×
[1-（
×
）]÷
．
| 5 |
| 9 |
| 3 |
| 4 |
| 1 |
| 10 |
87×
| 3 |
| 86 |
[1-（
| 1 |
| 4 |
| 3 |
| 8 |
| 1 |
| 4 |
（1）
×（
÷
）
=
×
=
（2）87×
=（86+1）×
=86×
+1×
=3+
=3
（3）[1-（
×
）]÷
=[1-
]÷
=
÷
=
| 5 |
| 9 |
| 3 |
| 4 |
| 1 |
| 10 |
=
| 5 |
| 9 |
| 15 |
| 2 |
=
| 25 |
| 6 |
（2）87×
| 3 |
| 86 |
=（86+1）×
| 3 |
| 86 |
=86×
| 3 |
| 86 |
| 3 |
| 86 |
=3+
| 3 |
| 86 |
=3
| 3 |
| 86 |
（3）[1-（
| 1 |
| 4 |
| 3 |
| 8 |
| 1 |
| 4 |
=[1-
| 3 |
| 32 |
| 1 |
| 4 |
=
| 29 |
| 32 |
| 1 |
| 4 |
=
| 29 |
| 8 |
练习册系列答案
相关题目