题目内容
观察下列分数特征,通过计算,总结规律
+
=
-
=
+
=
-
=
+
=
-
=
规律:
| 1 |
| 2 |
| 1 |
| 4 |
| 1 |
| 2 |
| 1 |
| 4 |
| 1 |
| 3 |
| 1 |
| 6 |
| 1 |
| 3 |
| 1 |
| 6 |
| 1 |
| 2 |
| 1 |
| 8 |
| 1 |
| 2 |
| 1 |
| 8 |
规律:
分析:根据分数加减法的计算方法,求出结果,然后再找出规律即可.
解答:解:
+
=
+
=
;
-
=
-
=
;
+
=
+
=
=
;
-
=
-
=
;
+
=
+
=
;
-
=
-
=
.
规律:一个分数的分母是另一个分数分母的倍数,通分时,以较大的分数的分母为公分母,然后再进行计算.
| 1 |
| 2 |
| 1 |
| 4 |
| 2 |
| 4 |
| 1 |
| 4 |
| 3 |
| 4 |
| 1 |
| 2 |
| 1 |
| 4 |
| 2 |
| 4 |
| 1 |
| 4 |
| 1 |
| 4 |
| 1 |
| 3 |
| 1 |
| 6 |
| 2 |
| 6 |
| 1 |
| 6 |
| 3 |
| 6 |
| 1 |
| 2 |
| 1 |
| 3 |
| 1 |
| 6 |
| 2 |
| 6 |
| 1 |
| 6 |
| 1 |
| 6 |
| 1 |
| 2 |
| 1 |
| 8 |
| 4 |
| 8 |
| 1 |
| 8 |
| 5 |
| 8 |
| 1 |
| 2 |
| 1 |
| 8 |
| 4 |
| 8 |
| 1 |
| 8 |
| 3 |
| 8 |
规律:一个分数的分母是另一个分数分母的倍数,通分时,以较大的分数的分母为公分母,然后再进行计算.
点评:本题关键是通过计算,求出各自的结果,然后再总结出规律.
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观察下列分数的特征,通过计算,总结出规律.
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规律:
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规律:
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