2^x=3^y=5^z.x,y,z属于R,比较2x.3y,5z的大小?
若2^x=3^y=5^z>1,比较2x,3y,5z的大小
x/2=y/3=z/5 x+3y-z/x-3y+z
x,y,z属于正实数,3^x=4^y=5^z,比较3x,4y,5z大小
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?
x,y,z属于R,x-2y+3z=0,y^2/xz的最小值是?
试证明(x+y-2z)+(y+z-2x)+(z+x-2y)=3(x+y-2z)(y+z-2x)(z+x-2y)
设x,y,z∈R+,且3^x=4^y=6^z比较3x,4y,6z的大小
x/3=y/4=z/5,求x+y+z/3x-2y+z的值,
若x/3=y/4=z/5,求x+y+z/3x-2y+z的值.
x+2y+3z=20,x+3y+5z=31,求x+y+z的值
已知x/4=y/5=z/6 求x+y+z/3x-2y+z的值
已知x/4=y/5=z/6,求x+y+z/3x-2y+z的值.