【考研类试卷】考研数学数学二-试卷41及答案解析.doc

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1、考研数学数学二-试卷 41及答案解析(总分:50.00,做题时间:90 分钟)一、选择题(总题数:9,分数:18.00)1.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。(分数:2.00)_2.设函数 f(x)在a,b上有定义,在开区间(a,b)内可导,则( ) (分数:2.00)A.B.C.D.3. (分数:2.00)A.B.C.D.4. (分数:2.00)A.B.C.D.5. (分数:2.00)A.B.C.D.6. (分数:2.00)A.B.C.D.7.若 f(x)不变号,且曲线 y=f(x)在点(1,1)处的曲率圆为 x 2 +y 2 =2,则函数 f(x)在区间(1,2)内

2、分数:2.00)A.有极值点,无零点B.无极值点,有零点C.有极值点,有零点D.无极值点,无零点8. (分数:2.00)A.B.C.D.9. (分数:2.00)A.B.C.D.二、填空题(总题数:6,分数:12.00)10.设矩阵 A满足 A 2 +A-4层=0,其中 E为单位矩阵,则(A-E) -1 = 1.(分数:2.00)填空项 1:_11. (分数:2.00)填空项 1:_12. (分数:2.00)填空项 1:_13.若四阶矩阵 A与 B为相似矩阵,A 的特征值为 12、13、14、15,则行列式B 1 E 1(分数:2.00)填空项 1:_14. (分数:2.00)填空项 1:_1

3、5.N(i 1 i 2 i n )+N(i n i 2 i 1 )= 1(分数:2.00)填空项 1:_三、解答题(总题数:10,分数:20.00)16.解答题解答应写出文字说明、证明过程或演算步骤。(分数:2.00)_17. (分数:2.00)_18. (分数:2.00)_19. (分数:2.00)_20. (分数:2.00)_21. (分数:2.00)_22. (分数:2.00)_23. (分数:2.00)_24.设集合 A(x,y)x+y10,集合 B(x,y) xy+10,求 A B(分数:2.00)_25.设 yf(x 2 b)其中 b为常数,f 存在二阶导数,求 y(分数:2.00

4、考研数学数学二-试卷 41答案解析(总分:50.00,做题时间:90 分钟)一、选择题(总题数:9,分数:18.00)1.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。(分数:2.00)_解析:2.设函数 f(x)在a,b上有定义,在开区间(a,b)内可导,则( ) (分数:2.00)A.B. C.D.解析:3. (分数:2.00)A.B.C. D.解析:解析:4. (分数:2.00)A. B.C.D.解析:解析:5. (分数:2.00)A.B.C.D. 解析:解析:6. (分数:2.00)A.B.C.D. 解析:解析:7.若 f(x)不变号,且曲线 y=f(x)在点(1,1)

5、处的曲率圆为 x 2 +y 2 =2,则函数 f(x)在区间(1,2)内(分数:2.00)A.有极值点,无零点B.无极值点,有零点 C.有极值点,有零点D.无极值点,无零点解析:8. (分数:2.00)A. B.C.D.解析:解析:9. (分数:2.00)A.B.C.D. 解析:二、填空题(总题数:6,分数:12.00)10.设矩阵 A满足 A 2 +A-4层=0,其中 E为单位矩阵,则(A-E) -1 = 1.(分数:2.00)填空项 1:_ (正确答案:正确答案:1/2(A+2E))解析:11. (分数:2.00)填空项 1:_ (正确答案:正确答案:a=-3/2)解析:解析:12. (分

6、数:2.00)填空项 1:_ (正确答案:正确答案:)解析:解析:13.若四阶矩阵 A与 B为相似矩阵,A 的特征值为 12、13、14、15,则行列式B 1 E 1(分数:2.00)填空项 1:_ (正确答案:正确答案:由已知 A与 B相似,则 A与 B的特征值相同, 即 B的特征值也为 12、13、14、15,从而 B 1 E 的特征值为 1,2,3,4,因此B 1 E1.2.3.424)解析:14. (分数:2.00)填空项 1:_ (正确答案:正确答案: )解析:15.N(i 1 i 2 i n )+N(i n i 2 i 1 )= 1(分数:2.00)填空项 1:_ (正确答案:正确

7、答案:n(n-1)/2)解析:三、解答题(总题数:10,分数:20.00)16.解答题解答应写出文字说明、证明过程或演算步骤。(分数:2.00)_解析:17. (分数:2.00)_正确答案:(正确答案: )解析:18. (分数:2.00)_正确答案:(正确答案: )解析:19. (分数:2.00)_正确答案:(正确答案: )解析:20. (分数:2.00)_正确答案:(正确答案: )解析:21. (分数:2.00)_正确答案:(正确答案: )解析:22. (分数:2.00)_正确答案:(正确答案: )解析:23. (分数:2.00)_正确答案:(正确答案: )解析:24.设集合 A(x,y)x+y10,集合 B(x,y) xy+10,求 A B(分数:2.00)_正确答案:(正确答案:本题求解主要依据交集的定义,两集合公共元素组成的集合,即两直线的交点 A B(x,y) xy10 且 xy10(0,1)解析:25.设 yf(x 2 b)其中 b为常数,f 存在二阶导数,求 y(分数:2.00)_正确答案:(正确答案:yf(x 2 b)2x yf(x。b)2x2xf(x 2 b)2 4x 2 f(x 2 b)2f(x 2 b)解析:

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