limit as x approaches 4 of (4-x)ln(x-4)

解答

x \to 4 lim ((4 - x) ln (x - 4))

不存在

求解步骤

x \to 4 lim ((4 - x) ln (x - 4))

若

x \to a^{-} lim f (x) \neq = x \to a^{+} lim f (x)

则极限不存在

x \to 4 + lim ((4 - x) ln (x - 4)) = 0

x \to 4 - lim ((4 - x) ln (x - 4)) =

不存在

= 不存在

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