A.x=80, y=30, z=50
B.x=50, y=80, z=80
C.x=30, y=50, z=80
D.x=50, y=30, z=30
A.x=30, y=50, z=80
B.x=50, y=80, z=80
C.x=80, y=30, z=50
D.x=50, y=30, z=30
已知调和函数,求其共轭调和函数
r(x,y)及解析函数f(z)=u((x,y))+ir(x,y).
A.if (x&&y) cout<<"x&&y"
B.if (x=y) cout<<"x=y"
C.if (x#y) cout<<"x#y"
D.if(x<>y) cout<<"x<>y"
已知3阶矩阵A与3维列向量x满足A3x=3Ax-A2x,且向量组x,Ax,A2x线性无关。
(1)记y=Ax,z=Ay,P=(x,y,z),求三阶矩阵B,使AP=PB;
(2)求|A|。