若x^2-xy+y^2-2z=0, x+y=2z+1则x=___,y=___,z=___

若|x-3|+|y+2|+|2z+1|=0,求(xy-yz)(y-x+z) 若x+y=6,xy=-8,求代数式(x+y-z)^2+(x+y-z)(x+y+z)-2·z(x-y) 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 代数 x^-y^/ x^-(y-z)^ 除以 x^+2xy+y^/(x-y)^-z^ 乘 x^+xy-xz/x^-xy 已知方程组x+2y-z=0,2x-y+8z=0,求x*x+y*y+z*z/xy+yz的值 xy-2x+y-z-2=0求导 若|x-3|+|y+z|+|2z+1|=0,求XY-YZ的值 若｜x-3｜+｜y+z｜+｜2z+1｜=0,求xy-yz的值 设z=f(x^2-y^2,e^（xy)),求偏导z/x,偏导z/y 若x^2-xy+y^2-2z=0, x+y=2z+1则x=___,y=___,z=___ 若x,y,z>0 则根号(x^2+y^2+xy)+根号(y^2+z^2=yz)>根号(x^2+z^2+xz)是求证题 若xy+yz+zx=0,3xyz+x^2(y+z)+y^2(z+x)+z^2(x+y)等于? 若/x+3/+/y-2/+/2z+1/=0,求(xy-yz)(y-x+z)的值 若：X^2-4X+Y+6Y+√ Z-3+13=0求（xy)^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]= 已知3x－y+2z=x+2y+3z=0,求（3x^－xy+2y^)/(2x^+4xy+y^)值? 已知0.5|x-y|+√(2y+z)+(z^2-z+0.25)=0,则z/xy的值是 设函数z=z(x,y)由方程e^(-xy)-2z+e^z=0确定,求z/x,z/y