تفسير سلوك دوال التجميع المتعلقة بالمساحة
مُقدَّم| English | المعنى |
|---|---|
| extrema/ekˈstremə/ | القيم القصوى |
Reading $g$ from the graph of $f$
- If $g(x)=\int_a^x f(t)\,dt$, then by FTC Part 1, $g'=f$ — so $f$ is the derivative of $g$.
- That means everything from Unit 5 applies: use $f$ (as $g'$) to analyze $g$.
- The sign of $f$ tells you where $g$ increases and decreases.
- The zeros of $f$ (where it changes sign) locate the extrema of $g$.
عند تحليل $g(x)=\int_a^x f\,dt$، يعمل الرسم البياني لـ $f$ كرسم بياني لـ $g'$.
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FTC الجزء 1: $g'=f$.
Increase/decrease from the sign of $f$
- Where $f(x)>0$: $g$ is increasing (area is being added).
- Where $f(x)<0$: $g$ is decreasing (area is being subtracted).
- So look at the graph of $f$: above the axis → $g$ climbs; below → $g$ falls.
- $g$ is the running total of signed area, so its direction follows $f$'s sign.
ترتفع g حيث f موجبة
y = f(t) (مدخل التكامل = g′)
بينما $f$ (الارتفاع المظلل) موجب، تتزايد المساحة المتراكمة $g$؛ وعندما يصبح $f$ سالباً، ينخفض $g$.
بالنسبة لـ $g(x)=\int_a^x f(t)\,dt$، $g$ متزايدة تماماً حيث...
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$g'=f$، لذا فإن $g$ تتزايد حيث $f>0$.
Extrema of $g$ where $f$ changes sign
- $g$ has a local max where $f$ (its derivative) changes from positive to negative.
- $g$ has a local min where $f$ changes from negative to positive.
- These are just the First Derivative Test applied to $g$, using $f$ as $g'$.
- The extrema 极值 of the accumulation function sit at the $x$-axis crossings of $f$.
$g$ لها قيمة عظمى محلية حيث $f$ يتحول من...
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$g'=f$ يذهب من $+\to-$ → قيمة عظمى محلية لـ $g$.
من الرسم البياني لـ $f$، يمكنك قراءة أي خصائص لـ $g=\int_a^x f\,dt$؟
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التزايد/التناقص، القيم القصوى، الانحناء — كل منها من $f$. القيم الدقيقة تحتاج إلى المساحة الفعلية.
Concavity of $g$ from the slope of $f$
- Since $g'=f$, we get $g''=f'$ — so the concavity of $g$ follows the slope of $f$.
- Where $f$ is increasing, $g$ is concave up; where $f$ is decreasing, $g$ is concave down.
- An inflection point of $g$ sits where $f$ has a local max or min (where $f'$ changes sign).
- One graph of $f$ tells you increase/decrease and concavity of $g$.
بما أن $g''=f'$، فإن $g$ محدبة لأعلى حيث $f$ هي ____.
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$g''=f'>0$ حيث $f$ ترتفع.
قيمة موجبة كبيرة لـ $f$ عند $x$ تعني أن $g$ هي...
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$f=g'$ هي المعدل؛ قيمة كبيرة لـ $f$ تعني أن $g$ ترتفع بسرعة، وليس أن $g$ كبيرة.
To analyze $g(x)=\int_a^x f\,dt$, treat the graph of $f$ as the graph of $g'$. Don't read $f$'s height as $g$'s height — read $f$'s sign for $g$'s increase/decrease, and $f$'s sign changes for $g$'s extrema. A big positive $f$ means $g$ is rising fast, not that $g$ is large.
$g(x)=\int_0^x f(t)\,dt$, where $f>0$ on $(0,3)$, $f(3)=0$, and $f<0$ on $(3,5)$.
- On $(0,3)$: $f>0$ → $g$ increasing. On $(3,5)$: $f<0$ → $g$ decreasing.
- At $x=3$: $f$ changes $+\to-$ → $g$ has a local maximum.
- So $g$ climbs to a peak at $x=3$, then falls.
For $g(x)=\int_a^x f(t)\,dt$, use $g'=f$: $g$ increases where $f>0$, decreases where $f<0$, and has extrema where $f$ changes sign. Since $g''=f'$, $g$ is concave up where $f$ is increasing. Read the graph of $f$ as the graph of $g'$.