计算5阶行列式-|||-0 2 3 4 5-|||-1 1 3 4 5-|||-1 2 2 4 5 = __-|||-1 2 3 3 5-|||-1 2 3 4 4

函数y=x^3在区间[-1,1]上不是()A. 奇函数B. 单调函数C. 有界函数D. 周期函数

|1 2 3 4-|||-4 3 2 1-|||-计算4阶行列式: 0 -1 2 3 __-|||-=-|||-1 6 3 2

12.设方程 +sqrt ({x)^2+(y)^2+(z)^2}=sqrt (2) 确定了函数 =z(x,y), 则z(x,y)-|||-在点 (1,0,-1) 处的全微分 =[ ] .-|||-(A) +sqrt (2)dy (B) -dx+sqrt (2)dy-|||-(C) -dx-sqrt (2)dy (D) -sqrt (2)dy

已知二次型((x)_(1),(x)_(2),(x)_(3))=({x)_(1)}^2+a({x)_(2)}^2+({x)_(3)}^2+2b(x)_(1)(x)_(2)+2(x)_(1)cdot (x)_可经正交变换((x)_(1),(x)_(2),(x)_(3))=({x)_(1)}^2+a({x)_(2)}^2+({x)_(3)}^2+2b(x)_(1)(x)_(2)+2(x)_(1)cdot (x)_化为((x)_(1),(x)_(2),(x)_(3))=({x)_(1)}^2+a({x)_(2)}^2+({x)_(3)}^2+2b(x)_(1)(x)_(2)+2(x)_(1)cdot (x)_则((x)_(1),(x)_(2),(x)_(3))=({x)_(1)}^2+a({x)_(2)}^2+({x)_(3)}^2+2b(x)_(1)(x)_(2)+2(x)_(1)cdot (x)_________，b=________.

在肝癌诊断中,有一种甲胎蛋白法,用这种方法能够检查出95%的真实患者,但也有可能将10%的人误诊。根据以往的记录,每10 000人中有4人患有肝癌,试求:(1)某人经此检验法诊断患有肝癌的概率;(2)已知某人经此检验法检验患有肝癌,而他确实是肝癌患者的概率。解:令=“被检验者患有肝癌”, =“用该检验法诊断被检验者患有肝癌”那么,=(1)==(2)==

9.函数f(x)=sin(2x+(pi)/(4))的麦克劳林展开式为____.

已知二维离散型随机变量(X,Y)的联合概率分布律为X Y -1 1 2-|||--1 0.1 0.2 0.3-|||-2 0.2 0.1 0.1求(1)X和Y的边缘分布率(2)X+Y的分布律(3)D(X)及E(XY)

抛物面=dfrac (1)(2)((x)^2+(y)^2) 被平面 =dfrac (1)(2)((x)^2+(y)^2)所截下有限部分的面积是=dfrac (1)(2)((x)^2+(y)^2)( A ) =dfrac (1)(2)((x)^2+(y)^2)( B ) =dfrac (1)(2)((x)^2+(y)^2)( C ) =dfrac (1)(2)((x)^2+(y)^2)( D ) =dfrac (1)(2)((x)^2+(y)^2)

4.设函数 f(x)= ) x-1, xlt 0, 0, x=0, x+1, xgt 0, .-|||-x=0,讨论当 arrow 0 时,f(x)的极限是否存在.

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