图中给出了 和 的图像。 的图像在 和 处有转折点,交 轴于 和 ,其渐近线方程为 , 和 。 的图像交 轴于 ,其渐近线方程为 和 。 在不同的图中,分别草拟以下函数的图像,清晰标明任何渐近线方程、任何坐标轴交点以及转折点(若有)的坐标。

- (a)
,
- (b)
,
- (c)
,
它不会直接告诉你答案,而是问你卡在哪一步看看 AI 是怎么陪你一步步弄懂这道题的
完整解法
1(a)
1. Determine the shape of the graph for $x \ge 0$ using the graph of $y = \mathrm{f}(|x|)$.
Since for , the graph of for is exactly the right half of the given graph of .
From the given graph, we extract the following features for :
- The curve passes through the origin .
- There is a vertical asymptote at , with the curve falling to as .
- For , the curve rises from , crossing the -axis at .
- There is a local maximum turning point at .
- The curve approaches the horizontal asymptote from above as .
2. Determine the shape of the graph for $x < 0$ using the graph of $y = \mathrm{f}'(x)$.
For , we refer to the given derivative graph .
The graph of is entirely below the -axis for , which means . Thus, must be strictly decreasing for all .
Furthermore, as , indicating that approaches a horizontal asymptote. Matching the horizontal asymptote on the right side, as .
Therefore, for , the curve of is a smooth, monotonically decreasing curve that approaches from below as and passes through . The asymptote seen in the graph is omitted as it was purely a reflection of due to the absolute value function.
A sketch of on Cartesian axes with the following features:
- Asymptotes: Vertical dashed line at and horizontal dashed line at .
- Axial Intercepts: Passes through the origin and the -axis at .
- Turning Point: A local maximum at .
- Shape: For , the curve approaches from below as , decreases smoothly through , and drops towards as it approaches from the left. For , it emerges from at , rises to cross , peaks at , and decreases to approach from above as .
1(b)
1. Determine the vertical asymptote(s) and axial intercept(s) of the reciprocal graph.
- Vertical Asymptotes: These occur where the original function . From the given graph, crosses the -axis at . Thus, is a vertical asymptote.
- -intercepts: These occur where . The given graph has a vertical asymptote at . Thus, at , giving an -intercept at .
- -intercept: Occurs at . Since is a finite negative value, the -intercept is negative (exact value unknown).
2. Determine the behavior and shape of the graph for $x < 3$.
- For : . As , , meaning . The curve rises from the bottom left, crosses the negative -axis, and smoothly passes through .
- For : . As , , meaning . The curve continues upward from to the vertical asymptote .
3. Determine the behavior, shape, and turning points for $x > 3$.
- For : . As , , so . As , , meaning .
- The graph of has a local minimum in the fourth quadrant. Correspondingly, its reciprocal will have a local maximum. Since the values are strictly negative in this region, the turning point (local maximum) lies below the -axis. Coordinates are marked as a turning point but remain unlabeled as exact values are not provided.
A sketch of the graph showing:
- Vertical Asymptote: .
- Axial Intercept: .
- Shape for : Curve comes from as , rises to cross the negative -axis, and passes through .
- Shape for : Curve continues to rise from towards as it approaches from the left.
- Shape for : Curve comes from as , rises to a local maximum point below the -axis (coordinates unlabeled as they are not determinable), and then falls back to as .
1(c)
1. Identify the geometrical transformations connecting $y = \mathrm{f}(|x|)$ to $y = -\mathrm{f}(|x-1|)$.
Let . The target function is .
This represents two transformations applied to the given graph of :
- A translation of unit in the positive -direction ().
- A reflection in the -axis ().
2. Apply transformations to the asymptotes and intercepts.
Asymptotes:
- The original vertical asymptotes are at and .
Translating them by gives and . Reflection in the -axis does not affect vertical lines. - The original horizontal asymptote is at .
Translation does not affect it. Reflection in the -axis moves it to .
Axial Intercepts:
- The original -intercepts are at , , and .
Translating by gives -intercepts at , , and . Reflection in the -axis leaves points on the -axis unchanged. - There is no -intercept because is a vertical asymptote.
3. Apply transformations to the turning points and describe the final shape.
Turning Points:
- The original local maximums are at , , and .
- Applying the translation ( to -coordinates) gives , , and .
- Applying the reflection (negating -coordinates) turns them into local minimums at , , and .
The final graph consists of three branches separated by the vertical asymptotes, opening upwards towards near the asymptotes, and approaching from below as .
A sketch with the following key features:
- Vertical asymptotes: (the -axis) and
- Horizontal asymptote:
- -intercepts: , , and
- Turning points (all local minimums): , , and
- The curve approaches from below as and approaches near the vertical asymptotes.
AI 分析,可能出错
用 AI 批改,圈出写错的那一步,并自动将你的薄弱点存入错题本,形成你的错因库。