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.
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