题目内容
(2011?咸丰县模拟)直接写出结果:
+0.5=
+
=
-
=
-
=
| 1 |
| 2 |
| 1 |
| 3 |
| 1 |
| 4 |
| 2 |
| 3 |
| 1 |
| 2 |
| 2 |
| 5 |
| 1 |
| 10 |
分析:
+0.5先把分数化成小数再计算;
+
先通分再相加;
-
,
-
,先通分再相减.
| 1 |
| 2 |
| 1 |
| 3 |
| 1 |
| 4 |
| 2 |
| 3 |
| 1 |
| 2 |
| 2 |
| 5 |
| 1 |
| 10 |
解答:解:
+0.5=1,
+
=
,
-
=
,
-
=
.
故答案为:1,
,
,
.
| 1 |
| 2 |
| 1 |
| 3 |
| 1 |
| 4 |
| 7 |
| 12 |
| 2 |
| 3 |
| 1 |
| 2 |
| 1 |
| 6 |
| 2 |
| 5 |
| 1 |
| 10 |
| 3 |
| 10 |
故答案为:1,
| 7 |
| 12 |
| 1 |
| 6 |
| 3 |
| 10 |
点评:本题考查了基本的分数加减法,分母不相同的要先通分再相加减.
练习册系列答案
相关题目