x+y+z=1,√(x*2+xy+y*2)+√(z*2+zy+y*2)+√(x*2+xz+z*2)的最小值是多少?

(xy-1)^2+(x+y-z)(x+y-zxy)因式分解 已知x,y,z∈R,求证:x^2+y^2>=xy+x+y-1 若|x-3|+|y+2|+|2z+1|=0,求(xy-yz)(y-x+z) X-y-z=x+( )=x-( ) 1-x+2xy-y=1-( ) 代数 x^-y^/ x^-(y-z)^ 除以 x^+2xy+y^/(x-y)^-z^ 乘 x^+xy-xz/x^-xy x+y+z=1,√(x*2+xy+y*2)+√(z*2+zy+y*2)+√(x*2+xz+z*2)的最小值是多少? (x+y-xy)/(x+y+2xy)=(y+z-2yz)/(y+z+3yz)=(z+x-3zx)/(z+x+4zx),且2/x=3/y=1/z,则xyz=? 已知（x+y-xy）/(x+y+2xy)=(y+z-2yz)/(y+z+3yz)=(z+x-3zx)/(z+x+4zx),且2/x=3/y-1/z,则xyz=? 解方程组：x+y=2 ,xy+z=1 设z=f(x^2-y^2,e^（xy)),求偏导z/x,偏导z/y 已知XY+X/X+Y+1=2 XZ+2X/X+Z+2=3 (Y+1)(Z+2)/Y+Z+3=4 求X+Y+Z的值已知(XY+X)/(X+Y+1)=2 (XZ+2X)/(X+Z+2)=3 [(Y+1)(Z+2)]/(Y+Z+3)=4 求X+Y+Z的值 (x^2-y^2)/[x^2-(y-z)^2]/[x^2+2xy+y^2]/[(x-y)^2-z^2]*[x^2+xy-xz]/[x^2-xy]= 化简(y-x)(z-x)/(x-2y+z)(x+y-2z)+（z-y)(x-y)/(xy-2z)(y+z-2x)+(x-z)(y-z)/(y+z-2x)(x-2y+z)速速回答 若x+y=6,xy=-8,求代数式(x+y-z)^2+(x+y-z)(x+y+z)-2·z(x-y) 2分之一(x+y+z)的平方＋2分之一（x-y-z)(x-y+z)-z(x+y),其中x-y=6,xy=21 若x-y=6,xy=-8,求代数式(x+y+z)²+(x-y-z)(x-y+z)-2·z(x+y)的值 x²-y²+5x+3y+4（x+y-2xy)(x+y-z)+(xy-1）² 已知0.5|x-y|+√(2y+z)+(z^2-z+0.25)=0,则z/xy的值是