题目内容
在横线里填上适当的数.
(1)
+
=1
(2)
-
=
(3)
+
=
(4)
-
=
.
(1)
| 2 |
| 7 |
| 5 |
| 7 |
| 5 |
| 7 |
(2)
| 9 |
| 13 |
| 6 |
| 13 |
| 6 |
| 13 |
| 3 |
| 13 |
(3)
| 8 |
| 15 |
| 8 |
| 15 |
| 2 |
| 15 |
| 10 |
| 15 |
(4)
| 8 |
| 11 |
| 8 |
| 11 |
| 5 |
| 11 |
| 3 |
| 11 |
分析:(1)根据“和-一个加数=另一个加数”解答;
(2)根据“被减数-差=减数”列式解答;
(3)根据““和-一个加数=另一个加数”解答;
(4)根据“被减数=差+减数”列式解答.
(2)根据“被减数-差=减数”列式解答;
(3)根据““和-一个加数=另一个加数”解答;
(4)根据“被减数=差+减数”列式解答.
解答:解:(1)因为1-
=
,
所以
+
=1
(2)因为
-
=
,
所以
-
=
,
(3)因为
-
=
,
所以
+
=
(4)因为
+
=
,
所以
-
=
;
故答案为:
,
,
,
.
| 2 |
| 7 |
| 5 |
| 7 |
所以
| 2 |
| 7 |
| 5 |
| 7 |
(2)因为
| 9 |
| 13 |
| 3 |
| 13 |
| 6 |
| 13 |
所以
| 9 |
| 13 |
| 6 |
| 13 |
| 3 |
| 13 |
(3)因为
| 10 |
| 15 |
| 2 |
| 15 |
| 8 |
| 15 |
所以
| 8 |
| 15 |
| 2 |
| 15 |
| 10 |
| 15 |
(4)因为
| 3 |
| 11 |
| 5 |
| 11 |
| 8 |
| 11 |
所以
| 8 |
| 11 |
| 5 |
| 11 |
| 3 |
| 11 |
故答案为:
| 5 |
| 7 |
| 6 |
| 13 |
| 8 |
| 15 |
| 8 |
| 11 |
点评:本题主要是利用加减法各部分之间的关系与同分母的分数的计算方法解决问题.
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