[考研类试卷]考研数学(数学三)模拟试卷251(无答案).doc

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考研数学(数学三)模拟试卷 251(无答案)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 7 8 设函数 f(x)在(,+)内有定义,x 00 是函数 f(x)的极大值点,则( ) (A)x 0 必是函数 f(x)的驻点(B) x0 必是函数f( x)的最小值点(C)对一切 x0 都有 f(x)f(x0)(D)x 0 必是函数f(x)的极小值点二、填空题9 10 11 12 设矩阵 A 满足 A2+A-4E=0,其中 E 为单位矩阵,则(A-E) -1=_.13 当 x0 时,f(x)=x-sinax 与 g(x)=x2ln(1-bx)是等价无穷小,则a=_,b=_.14 三、解答题解答应写出文字说明、证明过程或演算步骤。15 16 17 18 19 20 21 22 23

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