若limx→∞(x−bx)x=e3\lim\limits_{x \to \infty}(\dfrac{x - b}{x})^x = e^3x→∞lim(xx−b)x=e3,求bbb的值.
函数f(x)=4−x2f(x)=\sqrt{4 - x^2}f(x)=4−x2的定义域是( ).
(A)[−2,2][-2,2][−2,2]
(B)(−2,2)(-2,2)(−2,2)
(C)(−2,2](-2,2](−2,2]
(D)[−2,2)[-2,2)[−2,2)
limx→1lnxx−1\lim\limits_{x \to 1}\dfrac{\ln x}{x - 1}x→1limx−1lnx.
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