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์ˆ˜ํ•™์  ๊ท€๋‚ฉ๋ฒ•

์ˆ˜์—ด์˜ ๊ท€๋‚ฉ์  ์ •์˜ : ์ผ๋ฐ˜์ ์œผ๋กœ ์ˆ˜์—ด {$a_n$}์„ ์ฒ˜์Œ ๋ช‡ ๊ฐœ์˜ ํ•ญ๊ณผ ์ด์›ƒํ•˜๋Š” ์—ฌ๋Ÿฌ ํ•ญ ์‚ฌ์ด์˜ ๊ด€๊ณ„์‹์œผ๋กœ ์ •์˜ํ•˜๋Š” ๊ฒƒ ๋“ฑ์ฐจ์ˆ˜์—ด์˜ ๊ท€๋‚ฉ์  ์ •์˜ [1] $a_{n+1}=a_n+d$ $\Leftrightarrow a_{n+1}-a_n=d$ (์ผ์ •) (์ดํ•ญ) $\Leftrightarrow 2a_{n+1}=a_n+a_{n+2}$ (๋“ฑ์ฐจ์ค‘ํ•ญ์˜ ์„ฑ์งˆ ์ด์šฉ) [2] $a_{n+1}=a_n+f(n)$ → $a_n=a_1+f(1)+f(2)+...+f(n-1)$ (์ถ•์ฐจ๋Œ€์ž…๋ฒ• ์ด์šฉ) → $a_n=a_1+\sum_{k=1}^{n-1}f(k)$ (์™ธ์›Œ๋‘๋ฉด ์ •๋ง ํŽธ๋ฆฌ?) ๋“ฑ๋น„์ˆ˜์—ด์˜ ๊ท€๋‚ฉ์  ์ •์˜ [1] $a_{n+1}=r\times a_n$ $\Leftrightarrow \frac{a_{n+1}}{a_n}=r$ (์ผ์ •) $\L..

  • format_list_bulleted ๐Ÿซ Study/Math
  • · 2021. 8. 10.
  • textsms

๋งค3์‹œ๋ฆฌ์ฆˆ ์ž๋™์ฑ„์  ํ”„๋กœ๊ทธ๋žจ

https://i.scian.io/mae3 (test.mae3.com) ๋งค3 ๊ตญ์–ด ์‹œ๋ฆฌ์ฆˆ ์ž๋™์ฑ„์  ํ”„๋กœ๊ทธ๋žจ ์„ฑ์ ์ด ์˜ค๋ฅด๊ณ  ๋“ฑ๊ธ‰์ด ๋ฐ”๋€๋‹ค! ํ‚ค์ถœํŒ์‚ฌ ๋งค3 ๊ตญ์–ด ์‹œ๋ฆฌ์ฆˆ ์ž๋™์ฑ„์  ํ”„๋กœ๊ทธ๋žจ test.mae3.com ์ž๋™์ฑ„์ ์ด ๋˜๊ณ , 2์ฐจ ์ฑ„์ ๋„ ์นด์นด์˜ค๋‚˜ ๋„ค์ด๋ฒ„ ๋กœ๊ทธ์ธ์œผ๋กœ ๊ฐ€๋Šฅ (3๊ฐœ์›”๊ฐ„ ๋งˆํ‚น ๊ธฐ๋ก ํ™•์ธ ๊ฐ€๋Šฅ)

  • format_list_bulleted ๐Ÿซ Study/๊ธฐํƒ€ ๊ณผ๋ชฉ
  • · 2021. 8. 9.
  • textsms

์œ ๋ฆฌ์‹๊ณผ ์œ ๋ฆฌํ•จ์ˆ˜ - ๋ถ€๋ถ„๋ถ„์ˆ˜ ํ’€๊ธฐ

$\frac{1}{AB}=\frac{1}{B-A}(\frac{1}{A}-\frac{1}{B})$ >> $\frac{C}{AB}=\frac{C}{B-A}(\frac{1}{A}-\frac{1}{B})$ ($a\neq b$) (B๊ฐ€ A๋ณด๋‹ค ํฐ๊ฒŒ ์ข‹์Œ) (๊ณ 1 ์ˆ˜ํ•™I ์ˆ˜์—ด์˜ ํ•ฉ(์‹œ๊ทธ๋งˆ)์—์„œ๋„ ์‘์šฉํ•˜์—ฌ ์‚ฌ์šฉ๋จ..) ์ˆ˜์—ด์˜ ํ•ฉ - ์‹œ๊ทธ๋งˆ ($\sum$) ํ•ฉ์˜ ๊ธฐํ˜ธ ์‹œ๊ทธ๋งˆ ($\sum$ | Sigma) : ์ˆ˜์—ด $\{a_n\}$์˜ ์ฒซ์งธํ•ญ๋ถ€ํ„ฐ ์ œnํ•ญ๊นŒ์ง€์˜ ํ•ฉ $a_1+a_2+a_3+...+a_n$์„ ํ•ฉ์˜ ๊ธฐํ˜ธ $\sum$(์‹œ๊ทธ๋งˆ)๋ฅผ ์ด์šฉํ•˜์—ฌ $\sum_{k=1}^{n}a_k$์™€ ๊ฐ™์ด ๋‚˜ํƒ€๋‚ธ๋‹ค. >> ๋“ฑ์ฐจ์ˆ˜์—ด๋„, ๋“ฑ๋น„์ˆ˜.. blog.scian.io

  • format_list_bulleted ๐Ÿซ Study/Math
  • · 2021. 8. 7.
  • textsms
๋ถ€๋ถ„์˜ ํ•ฉ์ด ์ฃผ์–ด์ง„ ๋“ฑ๋น„์ˆ˜์—ด

๋ถ€๋ถ„์˜ ํ•ฉ์ด ์ฃผ์–ด์ง„ ๋“ฑ๋น„์ˆ˜์—ด

ex) ๋“ฑ๋น„์ˆ˜์—ด ${a_n}$์˜ ์ฒซ์งธํ•ญ๋ถ€ํ„ฐ ์ œnํ•ญ๊นŒ์ง€์˜ ํ•ฉ $S_n$์— ๋Œ€ํ•˜์—ฌ $S_n=30, S_{2n}=50$์ผ ๋•Œ, $S_{3n}$์˜ ๊ฐ’์„ ๊ตฌํ•˜์‹œ์˜ค. - ์Žˆ ์ˆ˜ํ•™ I / 146p 970๋ฒˆ ๋ฌธ์ œ $ \begin{aligned}\dfrac{a\left( r^{2n}-1\right) }{r-1}=50\\ \dfrac{a\left( r^{n}-1\right) }{r-1}=30\\ \dfrac{\dfrac{a\left( r^{2n}-1\right) }{r-1}}{\dfrac{a\left( r^{n}-1\right) }{r-1}}=\dfrac{5}{3}\\ \dfrac{r^{2n}-1^{2}}{r^{n}-1}=\dfrac{\left( r^{n}+1\right) \left( r^{n}-1\right) }{r^{..

  • format_list_bulleted ๐Ÿซ Study/Math
  • · 2021. 8. 7.
  • textsms

1๋ถ€ํ„ฐ ์‹œ์ž‘ํ•˜๋Š” ์—ฐ์†๋œ ํ™€์ˆ˜์˜ ํ•ฉ

1๋ถ€ํ„ฐ ์‹œ์ž‘ํ•˜๋Š” ์—ฐ์†๋œ ํ™€์ˆ˜ n๊ฐœ์˜ ํ•ฉ: $n^2$๊ฐœ ex)$1=1^2$ $1+3 = 2^2$ $1+3+5 = 3^2$

  • format_list_bulleted ๐Ÿซ Study/Math
  • · 2021. 8. 6.
  • textsms

๋“ฑ๋น„์ˆ˜์—ด ๋ฌธ์ œ์—์„œ ๋‹จ์„œ ์ฐพ๊ธฐ

*a: ์ฒซ์งธ ํ•ญ, r: ๊ณต๋น„ “๋ชจ๋“  ํ•ญ์ด ์–‘์ˆ˜”: a>0, r>0 ์ˆ˜์—ด ${a_n}$์ด $\frac{a_{n+1}}{a_n}= \frac{a_{n+2}}{a_{n+1}} $์„ ๋งŒ์กฑ: ๋“ฑ๋น„์ˆ˜์—ด์ด๋‹ค. https://blog.scian.io/4 ์ฐธ๊ณ . ๋“ฑ์ฐจ์ˆ˜์—ด๊ณผ ๋“ฑ๋น„์ˆ˜์—ด ์šฉ์–ด์ •๋ฆฌ ์ˆ˜์—ด: ๊ทœ์น™์„ฑ์žˆ๋Š” ์ˆ˜์˜ ๋ฐฐ์—ด ํ•ญ: ์ˆ˜์—ด์„ ์ด๋ฃจ๊ณ  ์žˆ๋Š” ๊ฐ ์ˆ˜ ์ผ๋ฐ˜ํ•ญ: ์ˆ˜์—ด์„ a1, a2, an ์ด๋ผ๊ณ  ํ•  ๋•Œ, ์ œ nํ•ญ์„ ์ˆ˜์—ด์˜ ์ผ๋ฐ˜ํ•ญ์ด๋ผ๊ณ  ํ•œ๋‹ค. (n๊ฐ’๋งŒ ๋Œ€์ž…ํ•˜๋ฉด ๋ฐ”๋กœ n๋ฒˆ์งธ ํ•ญ์˜ ๊ฐ’์„ ๊ตฌํ•  ์ˆ˜ ์žˆ blog.scian.io

  • format_list_bulleted ๐Ÿซ Study/Math
  • · 2021. 8. 6.
  • textsms
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