设线性方程组_(1)+(x)_(2)+(x)_(3)=0-|||-x https:/img.zuoyebang.cc/zyb_11f7ffe17b3d923f074d5dc9a2782d43.jpg+2(x)_(2)+a(x)_(3)=0-|||-x1 +4(x)_(2)+(a)^2(x)_(3)=0与方程_(1)+(x)_(2)+(x)_(3)=0-|||-x https:/img.zuoyebang.cc/zyb_77ef512f62a2b8fee52cb8e58adf12cf.jpg+2(x)_(2)+a(x)_(3)=0-|||-x1 +4(x)_(2)+(a)^2(x)_(3)=0有公共解，求a的值及所有公共解.

设函数-|||-f(x)-|||-在区间-|||-(1,2)-|||-内连续,-|||-https:/img.zuoyebang.cc/zyb_dcce33fe

[题目]设线性方程组 _(1)+(X)_(2)-(X)_(3)=-1-|||-(X)_(1)+K(X)_(2)-2(X)_(3)=0-|||-(X)_(1)+2

X=2 =0.3 , X=4 =0.5 ,则下列选项正确-|||-的是 ()-|||-A 当 https:/img.zuoyebang.cc/zyb_7f1da

设二维随机变量 ( X , Y ) 的联合密度为f(x,y)= https:/img.zuoyebang.cc/zyb_59648dc1443206d9838f

设总体X的概率分布为X 0 1 2-|||-P (theta )^2 https:/img.zuoyebang.cc/zyb_9a4dc435e7d9078a6

5.线性方程组 ) (x)_(1)-(x)_(2)=(a)_(1) 2(x)_(2)-(x)_(3)=(a)_(2) (x)_(1)+(x)_(2)-(x)

6.总体X的概率分布为-|||-x 0 1 2 3-|||-P θ^2 (1-0) θ^2 https:/img.zuoyebang.cc/zyb_d23f4d

线性方程组-|||-线性方程组-|||- ) 2(x)_(1)-3(x)_(2)=2, (x)_(1)+4(x)_(2)=-1 .-|||-的矩阵表示式为

-dfrac (2)({x)^2} .-|||-C 2x+3 ;-|||-D https:/img.zuoyebang.cc/zyb_c1dbf8c08bc60

解方程 https:/img.zuoyebang.cc/zyb_7e8f43fce8d9495be1e56a8b33129708.jpg+(e)^2=0.