题目内容
你有几种填法?
+
=
-
=
.
| () |
| 5 |
| () |
| 5 |
| 4 |
| 5 |
| () |
| 9 |
| () |
| 9 |
| 1 |
| 9 |
分析:根据同分母分数相加减法的计算方法可知:同分母分数相加减,分母不变,只把分子相加减即可,因此以5为分母的分数,分子的和是4,所以它可以填1和3,、2和2;以9为分母的分数,它相减的差是1,所以可填9和8、8和7、7和6、6和5、5和4、4和3、3和2、2和1,据此解答即可.
解答:解:根据分析得:
+
=
,
+
=
;
-
=
,
-
=
,
-
=
,
-
=
,
-
=
,
-
=
,
-
=
,
-
=
.
| 1 |
| 5 |
| 3 |
| 5 |
| 4 |
| 5 |
| 2 |
| 5 |
| 2 |
| 5 |
| 4 |
| 5 |
| 9 |
| 9 |
| 8 |
| 9 |
| 1 |
| 9 |
| 8 |
| 9 |
| 7 |
| 9 |
| 1 |
| 9 |
| 7 |
| 9 |
| 6 |
| 9 |
| 1 |
| 9 |
| 6 |
| 9 |
| 5 |
| 9 |
| 1 |
| 9 |
| 5 |
| 9 |
| 4 |
| 9 |
| 1 |
| 9 |
| 4 |
| 9 |
| 3 |
| 9 |
| 1 |
| 9 |
| 3 |
| 9 |
| 2 |
| 9 |
| 1 |
| 9 |
| 2 |
| 9 |
| 1 |
| 9 |
| 1 |
| 9 |
点评:此题主要考查的是同分母分数相加减的计算方法的灵活应用.
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