题目内容
(2011?长春模拟)(
+1
+
)÷(
+
+
)
| 4 |
| 7 |
| 1 |
| 9 |
| 6 |
| 11 |
| 3 |
| 11 |
| 2 |
| 7 |
| 5 |
| 9 |
分析:通过观察发现,第一个括号内的分数分别是第二个括号内分数的2倍,所以把第一个括号内的数变为2×(
+
+
),即可得出答案.
| 3 |
| 11 |
| 2 |
| 7 |
| 5 |
| 9 |
解答:解:(
+1
+
)÷(
+
+
),
=(
+
+
)÷(
+
+
),
=2×(
+
+
)÷(
+
+
),
=2.
| 4 |
| 7 |
| 1 |
| 9 |
| 6 |
| 11 |
| 3 |
| 11 |
| 2 |
| 7 |
| 5 |
| 9 |
=(
| 4 |
| 7 |
| 10 |
| 9 |
| 6 |
| 11 |
| 3 |
| 11 |
| 2 |
| 7 |
| 5 |
| 9 |
=2×(
| 3 |
| 11 |
| 2 |
| 7 |
| 5 |
| 9 |
| 3 |
| 11 |
| 2 |
| 7 |
| 5 |
| 9 |
=2.
点评:此题重点考查学生的审题能力,以及运算技巧.
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