[考研类试卷]考研数学(数学三)模拟试卷329及答案与解析.doc

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考研数学(数学三)模拟试卷 329 及答案与解析一、选择题下列每题给出的四个选项中,只有一个选项符合题目要求。1 2 3 4 5 6 设 f(x)=ln10x,g(x)=x ,h(x)=e x/10,则当 x 充分大时有(A)g(x)2【试题解析】 从题意知参数 A 是在实数集中取值,这时幂函数 的定义域应为x0,故题目中的函数宜改为 以下讨论这个函数 f(x)的导函数 f(x)=x 在 x=0 处连续的条件显然 f(x)在 x=0 可导的充要条件是 1,且当1 时有 由 f(x)是偶函数,又可得故当 1 时 f(0)存在且等于0注意,当 1 时, 当 x于是右 则 的取值范围是2三、解答题解答应写出文字说明、证明过程或演算步骤。15 【正确答案】 16 【正确答案】 17 【正确答案】 18 【正确答案】 19 【正确答案】 【知识模块】 综合20 【正确答案】 【知识模块】 综合21 【正确答案】 【知识模块】 二重积分的计算22 【正确答案】 23 【正确答案】 P(其中有一个 4 点| 两枚骰子的点数各不相同 )=(25)/(65)=1/3【知识模块】 综合

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