【考研类试卷】考研数学三(微积分)模拟试卷186(无答案).doc

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1、考研数学三(微积分)模拟试卷 186 及答案解析(总分:54.00,做题时间:90 分钟)一、选择题(总题数:4,分数:8.00)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 f(x)在 xa 处二阶可导,则 (分数:2.00)A.f(a)B.f(a)C.2f(a)D.f(a)3.设 f(x)二阶连续可导, (分数:2.00)A.f(2)是 f(x)的极小值B.f(2)是 f(x)的极大值C.(2,f(2)是曲线 yf(x)的拐点D.f(2)不是函数 f(x)的极值,(2,f(2)也不是曲线 yf(x)的拐点4.若由曲线 y ,曲线上某点处的切线以及

2、 x1,x3 围成的平面区域的面积最小,则该切线是( ) (分数:2.00)A.B.C.D.二、填空题(总题数:6,分数:12.00)5. 1 (分数:2.00)填空项 1:_6.设函数 yf 满足 f(x)arctan (分数:2.00)填空项 1:_7.设 f(xin 2 ) (分数:2.00)填空项 1:_8. 1 (分数:2.00)填空项 1:_9.设 uu(x,y)二阶连续可偏导,且 (分数:2.00)填空项 1:_10.微分方程 xy (分数:2.00)填空项 1:_三、解答题(总题数:17,分数:34.00)11.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)_

3、12.求 (分数:2.00)_13.设 f(x)在a,)上连续,f(x)0,而 (分数:2.00)_14.已知 (分数:2.00)_15.设 f(x)在0,1上可导,f(0)0,f(x) (分数:2.00)_16.设 f(x)在a,b上连续,且 f(x)0,对任意的 x 1 ,x 2 a,b及 01,证明: fx 1 (1)x 2 f(x 1 )(1)f(x 2 )(分数:2.00)_17.设 f(x)在1,1上可导,f(x)在 x0 处二阶可导,且 f(0)0,f(0)4求 (分数:2.00)_18.设 x 3 3xyy 3 3 确定隐函数 yy(x),求 yy(x)的极值(分数:2.00)

4、19.设 f(x)在(,)上有定义,且对任意的 x,y(,)有f(x)f(y) xy证明: a b f(x)dx(ba)f(a) (分数:2.00)_20.求曲线 y3x 2 1与 x 轴围成的封闭区域绕直线 y3 旋转所得的旋转体的体积(分数:2.00)_21.设函数 f(x,y,z)一阶连续可偏导且满足 f(tx,ty,tz)t k f(x,y,z)证明: (分数:2.00)_22.设 f(x,y) 且 D:x 2 y 2 2x,求 (分数:2.00)_23.讨论级数 (分数:2.00)_24.设 yy(x)满足 yxy,且满足 y(0)1,讨论级数 (分数:2.00)_25.设 a 0 1,a 1 2,a 2 ,a n1 a n (n2)证明:当x1 时,幂级 数 (分数:2.00)_26.用变量代换 xsint 将方程(1x 2 ) (分数:2.00)_27.飞机在机场开始滑行着陆,在着陆时刻已失去垂直速度,水平速度为 v 0 (ms),飞机与地 面的摩擦系数为 ,且飞机运动时所受空气的阻力与速度的平方成正比,在水平方向的比 例系数为 k x (kgs 2 m 2 ),在垂直方向的比例系数为 k y (kgs 2 m 2 )设飞机的质量为 m(kg),求飞机从着陆到停止所需要的时间(分数:2.00)_

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