题目内容
在横线里填上合适的分数:
|
|
分析:先求出右边的计算结果,再根据减法算式中各部分的关系求解.
解答:解:(1)
+
+
,
=
+
,
=
;
即:
-
=
+
;
(2)
-(
+
),
=
-
,
=
;
即:
-
=
+
.
故答案为:
,
.
| 4 |
| 9 |
| 1 |
| 9 |
| 2 |
| 9 |
=
| 5 |
| 9 |
| 2 |
| 9 |
=
| 7 |
| 9 |
即:
| 7 |
| 9 |
| 2 |
| 9 |
| 4 |
| 9 |
| 1 |
| 9 |
(2)
| 11 |
| 12 |
| 5 |
| 12 |
| 5 |
| 12 |
=
| 11 |
| 12 |
| 10 |
| 12 |
=
| 1 |
| 12 |
即:
| 11 |
| 12 |
| 1 |
| 12 |
| 5 |
| 12 |
| 5 |
| 12 |
故答案为:
| 7 |
| 9 |
| 1 |
| 12 |
点评:本题根据减法算式中各部分的关系求解:减数+差=被减数;被减数-差=减数.
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