已知X,Y,Z是实数,且X2+Y2+Z2=3,X+Y+Z=1,则XYZ最大值是
已知X,Y,Z是实数,且X2+Y2+Z2=3,X+Y+Z=1,则XYZ最大值是
已知x,y,z∈R,且x+y+z=1,x2+y2+z2=3,则xyz的最大值是______.
已知xyz均为非负实数 且满足 x-y+2z=3 2x+y+z=3 求x2+y2+2z2的最大值和最小值
已知x、y、z、是正实数,且x+y+z=xyz,求1/(x+y)+1/(y+z)+1/(x+z)的最大值.
已知实数x,y,z满足x/(y+z)+y/(z+x)+z/(x+y)=1,求x2/(y+z)+y2/(z+x)+z2/(
已知x+y-z=0,2x-y-8z=0,且xyz不等于0,则x2+y2+z2/(xy+yz+zx)等于
已知x、y、z都是实数,且x2+y2+z2=1,则m=xy+yz+zx( )
若x2+y2+z2=(x+y+z)2,且x,y,z均不为零,则x+y+z/xyz=?
设实数x,y,z满足x2+y2+z2-xy-yz-zx=27,则|y-z|的最大值为?
已知xyz=1,x+y+z=2,x2+y2+z2=16,求1/x+y+1/y+z+1/x+z
已知x+y+z=3,x2+y2+z2=19,x3+y3+z3=30则xyz=?
x、y、z是正实数,(xy+yz)/x2+y2+z2最大值为