1998年考研数二真题及答案

去百度文库，查看完整内容>内容来自用户:wushaoxiong991998年全国硕士研究生入学统一考试数学二试题一、填空题(本题共5小题,每小题3分,满分15分,把答案填在题中横线上.)(1).(2)曲线与轴所围成的图形的面积.(3).(4)设连续,则.(5)曲线的渐近线方程为.二、选择题(本题共5小题,每小题3分,共15分.在每小题给出的四个选项中,只有一项符合题目要求,把所选项前的字母填在题后的括号内.)(1)设数列与满足,则下列断言正确的是( )(A)若发散,则发散(B)若无界,则必有界(C)若有界,则必为无穷小(D)若为无穷小,则必为无穷小(2)函数的不可导点的个数是( )(A) 0(B) 1(C) 2(D) 3(3)已知函数在任意点处的增量其中是比高阶的无穷小,且,则( )(A)(B)(C)(D)(4)设函数在的某个邻域内连续,且为其极大值,则存在,当时,必有( )(A)(B)(C)(D)(5)设是任一阶方阵,是其伴随矩阵,又为常数,且,则必有( )(A)(B)(C)(D)三、(本题满分5分)求函数在区间内的间断点,并判断其类型.四、(本题满分5分)确定常数的值,使五、(本题满分5分)利用代换将方程化简,并求出原方程的通解.六、(本题满分6分)计算积分.七、(本题满分6分)从船上向海中沉放某种探测仪器,按探测要求,需确定仪器的下沉深度(从海平面算起)与下沉速度之间的函数关系.设仪器在重力作用下,从海平面由静止开始铅直下沉【解析】设在同一个极限过程中【解析(2)

去百度文库，查看完整内容>内容来自用户:跨考考研1998年全国硕士研究生入学统一考试数学三试题一、填空题(本题共5小题,每小题3分,满分15分.把答案填在题中横线上.)(1)设曲线在点处的切线与轴的交点为,则.(2).(3)差分方程的通解为.(4)设矩阵满足,其中,为单位矩阵,为的伴随矩阵,则.(5)设是来自正态总体的简单随机样本,.则当,时,统计量服从分布,其自由度为.二、选择题(本题共5小题,每小题3分,共15分.每小题给出的四个选项中,只有一项符合题目要求,把所选项前的字母填在题后的括号内.)(1)设周期函数在内可导,周期为4.又则曲线在点处的切线的斜率为( )(A)(B)(C)(D)(2)设函数讨论函数的间断点,其结论为( )(A)不存在间断点(B)存在间断点(C)存在间断点(D)存在间断点(3)齐次线性方程组的系数矩阵记为.若存在三阶矩阵使得,则( )(A)且(B)且(C)且(D)且(4)设阶矩阵,若矩阵的秩为,则必为( )(A)(B)(C)(D)(5)设与分别为随机变量与的分布函数.为使是某一变量的分布函数,在下列给定的各组数值中应取( )(A)(B)(C)(D)三、(本题满分5分)设,求与.四、(本题满分5分)设,求.五、(本题满分6分)设某酒厂有一批新酿的好酒,如果现在(假定)就售出,总收入为.如果窖藏起来待来日按陈酒价格出售,年末总收入为假定银行的年利率为,并以连续复利计息(2)【解析】现求

应该是重新定义分位数的值，不管怎么定义，t函数是偶函数不会变。

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考专业不同，对数学的分数要求也不同，以工学为例：2012年：57分2011年：60分2010年：54分2009年：56分1998年：56分

98年现在满打满算也就23周岁，正常情况很多人是刚毕业。而且人生的路很长并不是一定就考研和公务员两条路，走不通可以换道走别的路嘛。

凡事想开些，天生我材必有用，一时的失利不等于永远的失败，相信未来会有一份属于、适合你的工作在等着你！加油！！！

选c啊 d是直接意思

应该是在than前，前一种在than后，理解意思是美国其它的地方比远西地区更宽敞，实际上意思刚好相反，远西地区比美国其它地区更宽敞