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人気のある微分積分 >

limit as x approaches infinity of 10x(ln(x+8)-ln(x))

解

x \to \infty lim (10 x (ln (x + 8) - ln (x)))

解

80

解答ステップ

x \to \infty lim (10 x (ln (x + 8) - ln (x)))

x \to a lim [c \cdot f (x)] = c \cdot x \to a lim f (x)

= 10 \cdot x \to \infty lim (x (ln (x + 8) - ln (x)))

ロピタル向けに書き換える

= 10 \cdot x \to \infty lim (\frac{ln ( 8 + x ) - ln ( x )}{\frac{1}{x}})

ロピタルの定理を適用する

= 10 \cdot x \to \infty lim (\frac{- \frac{8}{x ( x + 8 )}}{- \frac{1}{x ^{2}}})

簡素化

\frac{- \frac{8}{x ( x + 8 )}}{- \frac{1}{x ^{2}}} : \frac{8 x}{x + 8}

= 10 \cdot x \to \infty lim (\frac{8 x}{x + 8})

x \to a lim [c \cdot f (x)] = c \cdot x \to a lim f (x)

= 10 \cdot 8 \cdot x \to \infty lim (\frac{x}{x + 8})

最高の分母べき乗で割る:

\frac{1}{1 + \frac{8}{x}}

= 10 \cdot 8 \cdot x \to \infty lim (\frac{1}{1 + \frac{8}{x}})

x \to a lim [\frac{f ( x )}{g ( x )}] = \frac{lim _{x \to a} f ( x )}{lim _{x \to a} g ( x )}, x \to a lim g (x) \neq = 0

不定形式の場合を除く

= 10 \cdot 8 \cdot \frac{lim _{x \to \infty} ( 1 )}{lim _{x \to \infty} ( 1 + \frac{8}{x} )}

x \to \infty lim (1) = 1

x \to \infty lim (1 + \frac{8}{x}) = 1

= 10 \cdot 8 \cdot \frac{1}{1}

簡素化

= 80

グラフ

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