limit as x approaches infinity of (4^x)/(3^{x-1)}

解答

x \to \infty lim (\frac{4 ^{x}}{3 ^{x - 1}})

\infty

求解步骤

x \to \infty lim (\frac{4 ^{x}}{3 ^{x - 1}})

化简

3^{x - 1} : 3^{x} \cdot 3^{- 1}

= x \to \infty lim (\frac{4 ^{x}}{3 ^{x} \cdot 3 ^{- 1}})

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

= \frac{1}{3 ^{- 1}} \cdot x \to \infty lim (\frac{4 ^{x}}{3 ^{x}})

\frac{1}{3 ^{- 1}} = 3

= 3 \cdot x \to \infty lim (\frac{4 ^{x}}{3 ^{x}})

使用指数法则:

\frac{a ^{c}}{b ^{c}} = (\frac{a}{b})^{c}

= 3 \cdot x \to \infty lim ((\frac{4}{3})^{x})

运用一般极限法则:

x \to \infty lim (a^{x}) = \infty, a > 1

= 3 \cdot \infty

运用无穷大属性:

c \cdot \infty = \infty

= \infty

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