函数f(x)=1x+2f(x)=\dfrac{1}{\sqrt{x + 2}}f(x)=x+21的定义域为(). (A)[−2,+∞)[ - 2, +\infty)[−2,+∞) (B)(−2,+∞)( - 2, +\infty)(−2,+∞) (C)(−∞,−2](-\infty, - 2](−∞,−2] (D)(−∞,−2)(-\infty, - 2)(−∞,−2)
函数f(x)=xln(1+x3)f(x)=x\ln(1 + x^3)f(x)=xln(1+x3)在定义域内是(). (A)不确定奇偶性 (B)偶函数 (C)非奇非偶函数 (D)奇函数
极限limx→1x−1x2−1=\lim\limits_{x \to 1}\dfrac{x - 1}{x^2 - 1} =x→1limx2−1x−1=(). (A)12\dfrac{1}{2}21 (B)0 (C)1 (D)不存在
当x→0x \to 0x→0时,1−cosx1 - \cos x1−cosx是ln(1+1x2)\ln(1 + \dfrac{1}{x^2})ln(1+x21)的(). (A)高阶无穷小 (B)低阶无穷小 (C)等价无穷小 (D)同阶但非等价无穷小
∫022−x2dx=\int_{0}^{\sqrt{2}} \sqrt{2 - x^2}dx =∫022−x2dx=(). (A)12π\dfrac{1}{2}\pi21π (B)π\piπ (C)32π\dfrac{3}{2}\pi23π (D)2π2\pi2π
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