xy-xz+y-z 急>

xy-xz+y-z 急> 因式分解xy-xz+y-z xy-xz+y-z 急>< 0 0 有全部最好 三元方程解法,急,在线等xy+0.03y=360xz-0.02z=360xy+xz=720 (2X+Z-Y)/(X^2-XY+XZ-YZ)-(Y-Z)/(X^2-XY-XZ+YZ) 【急求】求证不等式：x²+y²+z²≥xy+yz+xz 化简(2x-y-z/x^2-xy-xz+yz)+(2y-x-z/y^2-xy-yz+xz)+(2x-x-y/z^2-xz-yz+xy) 已知x＜0＜z,xy＞0,且|y|＞|z|＞|x|,求y/|xy|+1/|x|-|x-y|的值...急....算式错了...应该是求y/|xy|+1/|x|-2xz/|xz|的值 xy-xz+y-z(因式分解）怎么做? 因式分解xy-xz-y^2+2yz-z^2 xy-xz+2yz-y平方-z平方 xyz-xy-xz+x-yz+y+z-1因式分解 还是因式分解 xyz-xy-xz+x-yz+y+z-1 设xyz是非零实数求|x|/x+|y|/y+|z|/z+|xy|/xy+|xz|/xz+|yz|/yz+|xyz|/xyz 求(2X+Z-Y)/(X^2-XY+XZ-YZ)-(2X+Y+Z)/(X^2+XY+XZ+YZ) 代数 x^-y^/ x^-(y-z)^ 除以 x^+2xy+y^/(x-y)^-z^ 乘 x^+xy-xz/x^-xy X,Y,Z均为实数,且xy+2yz+2xz=1,则xyz(x+y+2z)的最大值为-----,急. 解方程组：xy/(x+y)=1/27,yz/(y+z)=1/33,xz/(x+z)=1/30急