题目内容
写出各循环小数的近似值.(保留三位小数)
6.
≈
0.
2
2.
≈
4.
0
≈
0.
≈
8.
≈
6.
| ? |
| 2 |
| ? |
| 8 |
6.283
6.283
;0.
| ? |
| 9 |
| ? |
| 8 |
0.929
0.929
;2.
| ? |
| 3 |
2.333
2.333
;4.
| ? |
| 9 |
| ? |
| 4 |
4.905
4.905
;0.
| ? |
| 8 |
0.009
0.009
;8.
| ? |
| 9 |
9.000
9.000
.分析:保留三位小数,即精确到千分位,看小数点后面第四位,利用“四舍五入”法分部解答即可.
解答:解:6.
≈6.283;
0.
2
≈0.929;
2.
≈2.333;
4.
0
≈4.905;
0.
≈0.889;
8.
≈9.000;
故答案为:6,283,0.929,2.333,4.905,0.8889,9.000.
| ? |
| 2 |
| ? |
| 8 |
0.
| ? |
| 9 |
| ? |
| 8 |
2.
| ? |
| 3 |
4.
| ? |
| 9 |
| ? |
| 4 |
0.
| ? |
| 8 |
8.
| ? |
| 9 |
故答案为:6,283,0.929,2.333,4.905,0.8889,9.000.
点评:此题主要考查小数的近似数取值,关键要看清精确到的位数.
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