4.已知两个线性变换:-|||- ) (y)_(1)=(x)_(1)+2(x)_(2)+3(x)_(3) (y)_(2)=-(x)_(1)+3(x)_(2)-(x)_(3) .-|||-;-|||-求(1)从x1,x2,x3到z1,z2的线性变换;(2)从z 1,z2到y1,y2的线性变换.

已知两个线性变换： ) (y)_(1)=2(x)_(1)+(x)_(2) (y)_(2)=3(x)_(1)-(x)_(2)+2(x)_(3) (y)_(3)=

3.已知两个线性变换-|||- ) (x)_(1)=2(y)_(1)+ (y)_(3) (x)_(2)=-2(y)_(1)+3(y)_(2)+2(y)_(3

3.已知两个线性变换-|||- ) (x)_(1)=2(y)_(1)+(y)_(3), (x)_(2)=-2(y)_(1)+3(y)_(2)+2(y)_(3)

10.已知线性变换-|||- ) (x)_(1)=2(y)_(1)+2(y)_(2)+(y)_(3) (x)_(2)=3(y)_(1)+(y)_(2)+5(y

曲线y=(x-1 )3√x^2的凹区间为（ ）y=(x-1 )3√x^2y=(x-1 )3√x^2y=(x-1 )3√x^2y=(x-1 )3√x^2曲线的凹区

4.已知非齐次线性方程组-|||- ) (x)_(1)+5(x)_(2)-(x)_(3)-(x)_(4)=-1 (x)_(1)-2(x)_(2)+(x)_(3

4.利用逆矩阵解下列线性方程组:-|||-(1) ) (x)_(1)-(x)_(2)+2(x)_(3)=1, -2(x)_(1)-(x)_(2)-2(x)_

已知函数 =(x)^3y+3(x)^2(y)^2-x(y)^3 ,则 =(x)^3y+3(x)^2(y)^2-x(y)^3 ( ) A =(x)^3y+3

求下列函数的定义域：（1）y=sqrt(2x+4)；（2）y=(1)/(x-3)+sqrt(16-x^2)；（3）y=ln（x2-2x-3）；（4）y=(sqr

线性方程组 ) (x)_(1)+2(x)_(2)-2(x)_(3)=1 2(x)_(1)+4(x)_(2)-4(x)_(3)=2 3(x)_(1)+6(x)_