limit as x approaches 1+of 7/(1-x)

解答

x \to 1 + lim (\frac{7}{1 - x})

- \infty

求解步骤

x \to 1 + lim (\frac{7}{1 - x})

x

从右侧趋近于

1, x > 1 \Rightarrow 1 - x < 0

分母从左侧趋近于 0，为负值

= - \infty

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