设4阶方阵A=(2α,3x,4y,z),B=(β,2x,3y,4z),其中αβxyz均为4维列向量,已知det(A)=2
已知xyz满足x+y+z=30,3x+y-z=50,设t=5x+4y+2z 1当t=40时,求xyz的值 2若xyz均为
已知4x-3y+z=0,x+2y-8z=0,xyz不等于0,求x+y-z/x-y+2z的值
已知方程组4x-y+3z=0 2x+y+6z=0且xyz不等于0,则x/y+y/z+z/x是多少
设正数xyz满足2x+3y+4z=9,则1/x+y +4/2y+z +9/3z+x最小值
已知:A=2x^3-xyz,B=y^3-z^3+xyz,C=-x^3+2y^2-xyz,且(x+1)^2+|y-1|+|
x:y:z=2:3:4且x+y+z=18求xyz
已知x,y,z属于R+(正实数),且xyz(x+y+z)=4+2*根号下3,则(x+y)(y+z)的最小值是?
方程组:x-2y+4z=0,2x+3y-3z=0...xyz不等于0,求(2x+y-z)\(2x-y+z)
已知x:y:z=4:5:6,且x+2y+3z=64,求xyz的值.用设k法,在线等
已知x^3+y^3-z^3=96,xyz=4,x^2+y^2+z^2-xy+xz+yz=12,则x+y-z等于
已知:x+y-z=4x^2+y^2-z^2=12x^3+y^3-z^3=34求xyz
已知有理数x.y.z满足(x-z-2)^2+(3x-6y-7)^2=/3y+3z-4/=0求xyz=多少