连续性与间断点单选题1--科数网kmath.cn

1. （单选题）若

lim_{x \to 0} \frac{a x^{2} + b x + 1 - e^{x^{2} - 2 x}}{x^{2}} = 2

, 则

A、

a = 5, b = - 2

B、

a = - 2, b = 5

C、

a = 2, b = 0

D、

a = 4, b = - 4