题目内容
|
|
1-
|
|
分析:分母相同的分数相加减,分母不变,分子直接相加减;1可以看作分子分母相同的任意分数;因此得解.
解答:解:
+
=1,
+
=
,
1-
+
=
-
+
=
,
+
+
=
=
.
| 9 |
| 10 |
| 1 |
| 10 |
| 5 |
| 21 |
| 6 |
| 21 |
| 11 |
| 21 |
1-
| 5 |
| 10 |
| 2 |
| 10 |
| 10 |
| 10 |
| 5 |
| 10 |
| 2 |
| 10 |
| 7 |
| 10 |
| 1 |
| 9 |
| 5 |
| 9 |
| 2 |
| 9 |
| 1+5+2 |
| 9 |
| 8 |
| 9 |
点评:本题考查了分数加减法的计算法则.
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