BD 的斜率是-1/B², xy=1 过A点的切线的斜率是什么?
这两条直线什么关系?
BD 的斜率是-1/B², xy=1 过A点的切线的斜率是什么?
这两条直线什么关系?
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可能有误解,我拿了笔,是不大糊涂大的.
-jinjing-
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07/03/2011 postreply
10:04:32
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