已知线性变换:_(1)=2(y)_(1)+2(y)_(2)+(y)_(3),-|||-_(2)=3(y)_(1)+(y)_(2)+5(y)_(3),-|||-_(3)=3(y)_(1)+2(y)_(2)+3(y)_(3),求从变量x1 x2 x3到变量y1 y2 y3的线性变换.,

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

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

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)=

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)-

已知α1,α2,β,y是3维列向量，矩阵α1,α2,β,y，α1,α2,β,y，且α1,α2,β,y，α1,α2,β,y，则α1,α2,β,y36812已知是3

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

1.计算:(3x+y+2)(3x-y-2).2.已知(3x+y+2)(3x-y-2).求（a+b-c）²。3.设x>0,且(3x+y+2)(3x-y-2).求(

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

[单选题]如x⊕y＝x2＋y2，则3⊕1⊕3＝（　　）。A.109B.100C.120D.160