题目内容
(2011?长春模拟)(9
+7
)÷(
+
)
| 2 |
| 7 |
| 2 |
| 9 |
| 5 |
| 7 |
| 5 |
| 9 |
分析:根据分数的意义可提取加数中分数相同的分子,然后再根据乘法分配律进行计算即可得到答案.
解答:解:(9
+7
)÷(
+
)
=(
+
)÷[5×
+5×
)],
=(65×
+65×
)÷(5×
+5×
),
=65×(
+
)÷[5×(
+
)],
=65×(
+
)÷5÷(
+
),
=65÷5,
=13.
| 2 |
| 7 |
| 2 |
| 9 |
| 5 |
| 7 |
| 5 |
| 9 |
=(
| 65 |
| 7 |
| 65 |
| 9 |
| 1 |
| 7 |
| 1 |
| 9 |
=(65×
| 1 |
| 7 |
| 1 |
| 9 |
| 1 |
| 7 |
| 1 |
| 9 |
=65×(
| 1 |
| 7 |
| 1 |
| 9 |
| 1 |
| 7 |
| 1 |
| 9 |
=65×(
| 1 |
| 7 |
| 1 |
| 9 |
| 1 |
| 7 |
| 1 |
| 9 |
=65÷5,
=13.
点评:解答此题的关键是提取加数中两个分数的相同的分子,然后再按照乘法分配律进行计算.
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