题目内容
求：0.1
+0.2
+0.3
+0.4
+0.5
+0.6
+0.7
+0.8
．
| ? |
| 2 |
| ? |
| 3 |
| ? |
| 4 |
| ? |
| 5 |
| ? |
| 6 |
| ? |
| 7 |
| ? |
| 8 |
| ? |
| 9 |
分析：根据题意，由循环小数与分数的关系，把循环小数换算成分数，再根据分数的巧算进行计算即可．
解答：解：0.1
+0.2
+0.3
+0.4
+0.5
+0.6
+0.7
+0.8
=
+
+
+
+
+
+
+
=
=
=
=
=4
．
| ? |
| 2 |
| ? |
| 3 |
| ? |
| 4 |
| ? |
| 5 |
| ? |
| 6 |
| ? |
| 7 |
| ? |
| 8 |
| ? |
| 9 |
=
| 11 |
| 90 |
| 21 |
| 90 |
| 31 |
| 90 |
| 41 |
| 90 |
| 51 |
| 90 |
| 61 |
| 90 |
| 71 |
| 90 |
| 81 |
| 90 |
=
| 11+21+31+41+51+61+71+81 |
| 90 |
=
| (11+81)×8÷2 |
| 90 |
=
| 368 |
| 90 |
=
| 184 |
| 45 |
=4
| 4 |
| 45 |
点评：本题主要考查循环小数与分数的转化，然后再根据题意进一步解答即可．
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