通过将曲线方程 表示为 的形式(其中 和 是常数),描述一个由三个变换组成的序列,该序列将 的图像映射到 的图像上。 图中显示了 的图像。该曲线在 处有一个极大值点,在 处有一个极小值点。曲线的渐近线方程为 , 和 。 画出 的草图,清晰标出渐近线的方程以及与坐标轴交点和极值点的坐标。
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完整解法
8(a)
1. Express the given equation in the required partial fraction form to identify constants $A$ and $B$.
Thus, and .
2. Determine the horizontal translation required to transform the denominator.
We start with the original curve .
To change the denominator to , we need to replace with :
This corresponds to a translation of units parallel to the -axis.
3. Determine the vertical scaling required to match the numerator.
Next, we multiply the function by to get the required numerator of :
This corresponds to a scaling parallel to the -axis with a scale factor of .
4. Determine the vertical translation required to complete the function mapping.
Finally, we add to the function to account for :
This corresponds to a translation of units parallel to the -axis.
Sequence of transformations:
- Translation of units parallel to the -axis.
- Scaling parallel to the -axis by a scale factor of .
- Translation of units parallel to the -axis.
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