题目内容
1-
-
-
-
=
.
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| 3 |
| 1 |
| 4 |
| 1 |
| 6 |
| 1 |
| 12 |
| 1 |
| 6 |
| 1 |
| 6 |
分析:先用减法的性质把原式写成1-(
+
+
+
),然后把
和
进行拆分,通过前后分数加、减相互抵消,得出结果.
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| 3 |
| 1 |
| 4 |
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| 6 |
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| 12 |
| 1 |
| 6 |
| 1 |
| 12 |
解答:解:1-
-
-
-
,
=1-(
+
+
+
),
=1-(
+
+
-
+
-
),
=1-(
+
),
=1-
,
=
.
| 1 |
| 3 |
| 1 |
| 4 |
| 1 |
| 6 |
| 1 |
| 12 |
=1-(
| 1 |
| 3 |
| 1 |
| 4 |
| 1 |
| 6 |
| 1 |
| 12 |
=1-(
| 1 |
| 3 |
| 1 |
| 4 |
| 1 |
| 2 |
| 1 |
| 3 |
| 1 |
| 3 |
| 1 |
| 4 |
=1-(
| 1 |
| 3 |
| 1 |
| 2 |
=1-
| 5 |
| 6 |
=
| 1 |
| 6 |
点评:此题主要考查学生对分数进行拆项,达到简算的目的.
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