设f(x)满足 f(1)=0 且设f(x)满足 f(1)=0 且，下列说法错误的是( ) A f(x)在x=1连续B f(x)在设f(x)满足 f(1)=0 且内有界C f(x)在x=1可导D f(x)在x=1的邻域内连续

13.求解下列齐次线性方程组:-|||-(1) ) (x)_(1)+(x)_(2)+2(x)_(3)-(x)_(4)=0, 2(x)_(1)+(x)_(2)+(x)_(3)-(x)_(4)=0, 2(x)_(1)+2(x)_(2)+(x)_(3)+ .-|||-(2) ) (x)_(1)+2(x)_(2)+(x)_(3)-(x)_(4)=0, 3(x)_(1)+6(x)_(2)-(x)_(3)-3(x)_(4)=0, 5(x)_(1)+10(x)_(2)+(x)_( .-|||-(3) { ) 2(x)_(1)+3(x)_(2)-(x)_(3)-7(x)_(4)=0, 3(x)_(1)+(x)_(2)+2(x)_(3)-7(x)_(3)=0, 4(x)_(1)+(x)_(2)-3(x)_ .-|||-(4) ) 3(x)_(1)+4(x)_(2)-5(x)_(3)+7(x)_(3)=0, 2(x)_(1)-3(x)_(2)+3(x)_(3)-2(x)_(4)=0, 4(x)_(1)+11(x)_(2)-1 .

必答下列语句中,是命题的是()A. 请把门关上！B. x >5C. 明天会下雨吗?D. 3是偶数

已知X服从 p=0.6 的(0,1)分布,且在 X=0 及 X=1 的条件下,Y的条件分布分别为-|||-Y 1 2 3 Y 1 2 3-|||- Y|X=0 dfrac (1)(4) dfrac (1)(2) a Y|X=1 dfrac (1)(2) b 1/31-|||-求:(1)常数a,b;-|||-(2)二维随机变量(X,Y)的分布律;-|||-(3) Y=1 的条件下X的条件分布律。

1.设向量 =([ 1,2,-1] )^T =([ 3,1,2] )^T, =([ -4,2,0] )^T, 试求:-|||-(1)a,b,c的长度和单位化向量;-|||-(2)(a,b),(b,c ),(a,c);-|||-(3),.

某型日光灯的使用寿命（小时）服从参数为的指数分布，该日光灯已使用 600 小时，则它还能再使用600小时的概率=_______.( 答案写出小数形式,保留到小数点后两位 )

3.计算:-|||-1 3 1-|||-1 4 0 0 -1 2-|||--1 3 4 1 -3 1-|||-4 0 -2

1.求下列向量组的秩,并求一个极大无关组:-|||-(1) _(1)=([ 1,3,2] )^T _(2)=([ -2,-1,1] )^T, _(3)=([ 3,5,2] )^T;-|||-(2) _(1)=([ 1,0,2,1] )^T, _(2)=([ 1,2,0,1] )^T _(3)=([ 2,1,3,2] )^T , _(4)=([ 2,5,-1,4] )^T.

34.设随机变量X在区间(0,1)内服从均匀分布.-|||-(1)求 =(e)^x 的概率密度.-|||-(2)求 =-2ln x 的概率密度.

求下列函数的导数： (1) =((2x+5))^4; (1) =((2x+5))^4; (1) =((2x+5))^4; (1) =((2x+5))^4; (1) =((2x+5))^4; (1) =((2x+5))^4; (1) =((2x+5))^4; (1) =((2x+5))^4; (1) =((2x+5))^4; (1) =((2x+5))^4.

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