若1/2x=1/3y=1/4z,且xyz≠0,求xyz
若1/2x=1/3y=1/4z且xyz不等于0,求x:y:z
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:A=2x^3-xyz,B=y^3-z^3+xyz,C=-x^3+2y^2-xyz,且(x+1)^2+|y-1|+|
xyz∈R+且 x+2y+3z=36求 1/x +2/y +3/z的最小值
已知2x+3y-4z=0,3x+4y+5z=0,且xyz≠0 .(1)分别用含有z的代数式表示x、y (2)求x+y+z
若x+y+z=0且xyz不等于0,求x(1/y+1/z)+y(1/x+1/z)+z(1/x+1/y)的值
先化简再求值3xyz+2(x^2y+y^2z-xyz)-xyz+2z^2x x=1 y= -1 z=2
x:y:z=2:3:4且x+y+z=18求xyz
己知x,y,z都是非零有理数,且满足|x|/x+|y|/y+z/|z|=1,请你求xyz/|xyz|的值.求因为所以?
若xyz不等于0,且满足(y+z)/x=(x+z)/y=(x+y)/z,求(y+z)(x+z)(x+y)/xyz的值
若xyz不等于0,且(y+z)/x=(z+x)/y=(x+y)/z,求(y+z)(z+x)(x+y)/xyz的值?
用均值不等式解题若x>0,y>0,z>0,且xyz(x+y+z)=1,求(x+y)(y+z)的最小值