题目内容
在括号里填上适当的分数.
+
=
+
=
-
=
-
=
-
=
-
=
+
=
+
=
.
| 3 |
| 10 |
| 2 |
| 5 |
| 3 |
| 10 |
| ( ) |
| 10 |
| ( ) |
| ( ) |
| 5 |
| 8 |
| 7 |
| 12 |
| ( ) |
| 24 |
| ( ) |
| ( ) |
| ( ) |
| ( ) |
| 4 |
| 5 |
| 3 |
| 4 |
| ( ) |
| ( ) |
| ( ) |
| ( ) |
| ( ) |
| ( ) |
| 1 |
| 4 |
| 3 |
| 10 |
| ( ) |
| ( ) |
| ( ) |
| ( ) |
| ( ) |
| ( ) |
分析:根据异分母分数加减法的计算法则:先通分,变成同分母的分数再计算进行填空即可.
解答:解:(1)
+
=
+
=
;
(2)
-
=
-
=
;
(3)
-
=
-
=
;
(4)
+
=
+
=
.
| 3 |
| 10 |
| 2 |
| 5 |
| 3 |
| 10 |
| 4 |
| 10 |
| 7 |
| 10 |
(2)
| 5 |
| 8 |
| 7 |
| 12 |
| 15 |
| 24 |
| 14 |
| 24 |
| 1 |
| 24 |
(3)
| 4 |
| 5 |
| 3 |
| 4 |
| 16 |
| 20 |
| 15 |
| 20 |
| 1 |
| 20 |
(4)
| 1 |
| 4 |
| 3 |
| 10 |
| 5 |
| 20 |
| 6 |
| 20 |
| 11 |
| 20 |
点评:本题考查了异分母分数加减法的计算方法,关键是正确的进行通分.
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