极限limn→∞n2+12n2−n+1=12\lim\limits_{n \to \infty} \dfrac{n^2 + 1}{2n^2 - n + 1} = \dfrac{1}{2}n→∞lim2n2−n+1n2+1=21.( )
limx→0arctan3xx=\lim\limits_{x \to 0} \dfrac{\arctan3x}{x} =x→0limxarctan3x=( ).
(A)0
(B)1
(C)2
(D)3
函数f(x)=ln(2−x)f(x)=\ln(2 - x)f(x)=ln(2−x)的定义域是( ).
(A)(−∞,2)(-\infty,2)(−∞,2)
(B)(−2,+∞)(-2,+\infty)(−2,+∞)
(C)(−2,2)(-2,2)(−2,2)
(D)(0,2)(0,2)(0,2)
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