题目内容
奇妙的循环小数.
1÷37=0.
2
2÷37=0.
5
3÷37=0.
8
4÷37=0.
0
5÷37=
6÷37=
7÷37=
试一试:
1÷41=
2÷41=
3÷41=
你发现了什么规律?
1÷37=0.
| ? |
| 0 |
| ? |
| 7 |
2÷37=0.
| ? |
| 0 |
| ? |
| 4 |
3÷37=0.
| ? |
| 0 |
| ? |
| 1 |
4÷37=0.
| ? |
| 1 |
| ? |
| 8 |
5÷37=
0.
3
| ? |
| 1 |
| ? |
| 5 |
0.
3
| ? |
| 1 |
| ? |
| 5 |
6÷37=
0.
6
| ? |
| 1 |
| ? |
| 2 |
0.
6
| ? |
| 1 |
| ? |
| 2 |
7÷37=
0.
8
| ? |
| 1 |
| ? |
| 9 |
0.
8
| ? |
| 1 |
| ? |
| 9 |
试一试:
1÷41=
0.
243
| ? |
| 0 |
| ? |
| 9 |
0.
243
| ? |
| 0 |
| ? |
| 9 |
2÷41=
0.
487
| ? |
| 0 |
| ? |
| 8 |
0.
487
| ? |
| 0 |
| ? |
| 8 |
3÷41=
0.
731
| ? |
| 0 |
| ? |
| 7 |
0.
731
| ? |
| 0 |
| ? |
| 7 |
你发现了什么规律?
n
n
÷41=0.
243
n
| ? |
| 0 |
| ? |
| 9 |
0.
243
n
.| ? |
| 0 |
| ? |
| 9 |
分析:根据商的变化规律可知,除数不变被除数扩大几倍(0除外),商也扩大相同的倍数,据此解答.
解答:解:1÷37=0.
2
2÷37=0.
5
3÷37=0.
8
4÷37=0.
0
5÷37=0.
3
6÷37=0.
6
7÷37=0.
8
试一试:
1÷41=0.
243
2÷41=0.
487
3÷41=0.
731
发现的规律:n÷41=0.
243
n;
故答案为:0.
3
,0.
6
,0.
8
,0.
243
,0.
487
,0.
731
,n,0.
243
n.
| ? |
| 0 |
| ? |
| 7 |
2÷37=0.
| ? |
| 0 |
| ? |
| 4 |
3÷37=0.
| ? |
| 0 |
| ? |
| 1 |
4÷37=0.
| ? |
| 1 |
| ? |
| 8 |
5÷37=0.
| ? |
| 1 |
| ? |
| 5 |
6÷37=0.
| ? |
| 1 |
| ? |
| 2 |
7÷37=0.
| ? |
| 1 |
| ? |
| 9 |
试一试:
1÷41=0.
| ? |
| 0 |
| ? |
| 9 |
2÷41=0.
| ? |
| 0 |
| ? |
| 8 |
3÷41=0.
| ? |
| 0 |
| ? |
| 7 |
发现的规律:n÷41=0.
| ? |
| 0 |
| ? |
| 9 |
故答案为:0.
| ? |
| 1 |
| ? |
| 5 |
| ? |
| 1 |
| ? |
| 2 |
| ? |
| 1 |
| ? |
| 9 |
| ? |
| 0 |
| ? |
| 9 |
| ? |
| 0 |
| ? |
| 8 |
| ? |
| 0 |
| ? |
| 7 |
| ? |
| 0 |
| ? |
| 9 |
点评:本题这种找规律的题,要善于从前后数之间的差、和或商找个规律,并用规律回到问题中解答问题.
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