题目内容
分数单位是
的所有真分数之和是( )
| 1 |
| 9 |
分析:分数单位是
的真分数有
,
,
,
,
,
,
,
.
| 1 |
| 9 |
| 1 |
| 9 |
| 2 |
| 9 |
| 3 |
| 9 |
| 4 |
| 9 |
| 5 |
| 9 |
| 6 |
| 9 |
| 7 |
| 9 |
| 8 |
| 9 |
解答:解:
+
+
+
+
+
+
+
=
=4;
故选:D.
| 1 |
| 9 |
| 2 |
| 9 |
| 3 |
| 9 |
| 4 |
| 9 |
| 5 |
| 9 |
| 6 |
| 9 |
| 7 |
| 9 |
| 8 |
| 9 |
| 36 |
| 9 |
故选:D.
点评:本题考查的是对真分数的理解与掌握.
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