已知x,y,z∈R,若-1,x,y,z,-3成等比数列,则xyz的值为( )
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?
已知x,y,z∈R+,且x+2y+3z=3,.则xyz的最大值是_____.
已知:(x+y)/z=(x+z)/y=(z+y)/x,且xyz不等于0,则分式(x+y)(x+z)(z+x)/xyz的值
已知x,y,z∈R^+,x+y+z=xyz,且去1/(x+y)+1/(y+z)+1/(z+x)≤k恒成立,则k的取值范围
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
若实数x,y,z满足x+y/1=4,y+z/1=1,z+x/1=3/7,则xyz的值为多少
已知x,y,z∈R,且x+y+z=1,x2+y2+z2=3,则xyz的最大值是______.
已知x,y,z∈R+,3x+2y+z=6 求xyz的最大值
已知X,Y,Z属于R+ ,且X+2Y+3Z=3,则XYZ的最大值
已知xyz属于R+,x+y+z=1,求证x^3/(y(1-y))+y^3/(z(1-z))+z^3/(x(1-x))大于
已知有理数x,y,z满足x+y+z=0,xyz=8,则1/x+1/y+1/z的值是( )
已知3/x+y=4/x+y=5/y+z,求xyz/(x+y)(y+z)(z+x)的值