设x,y,z属于R+,求证:x^4+y^4+z^4=(x+y+z)xyz
设x,y,z 都属于R,且(x-z)²-4(x-y)(y-z)=0,求证:x,y,z成等比数列.
设x,y,z属于R且3^x=4^y=6^z
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?
3^x=4^y=6^z 求证1/z-1/x=1/zy 比较3x.4y 6z的大小 xyz∈R+
设x.y.z满足3x=4y=6z(x.y.z都是指数)求证
x*x+y*y+2z*z-2x+4y+4z+7=0,求xyz的值
设x,y,z∈R+,且3x=4y=6z.
1.设X ,Y,Z 成等差数列,代数式(X-Z)*(X-Z)+ 4(X-Y)(Z-Y)=
已知x.y.z属于R,求证:(1+x^2)(1+y^2)(1+z^2)大于等于8xyz
设正数xyz满足2x+3y+4z=9,则1/x+y +4/2y+z +9/3z+x最小值
设xyz均为正实数,且x+y+z=1,求证1/x+4/y+9/z≥36