摘要： By living life “on purpose successful people can A. do a lot of work without using more money. B. concentrate on their jobs C. do business with many people easily. D. share what they have with every one unselfishly.
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设x，y满足约束条件
，若目标函数z=ax+by（8b＞a＞0）的最大值为5，则
+
的最小值为（ ）
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| 1 |
| a |
| 2 |
| b |
| A、5 | B、6 | C、7 | D、8 |
已知P1（x1，y1），P2（x2，y2）是直线ax+by+c=0（b≠0）上的两点，则P1P2的长是（ ）
A、
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B、
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C、
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D、
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