6x^2-13xy+6y^2+8xz-2yz-8z^2因式分解
(2X+Z-Y)/(X^2-XY+XZ-YZ)-(Y-Z)/(X^2-XY-XZ+YZ)
因式分解x^2-xy+xz-yz
设x,y,z∈R+,xy+yz+xz=1,证明不等式:(xy)^2/z+(xz)^2/y+(yz)^2/x+6xyz≥x
求(2X+Z-Y)/(X^2-XY+XZ-YZ)-(2X+Y+Z)/(X^2+XY+XZ+YZ)
因式分解x^2+y^2+z^2+2xy+2yz+2xz-2x-2y-2z+1
化简(2x-y-z/x^2-xy-xz+yz)+(2y-x-z/y^2-xy-yz+xz)+(2x-x-y/z^2-xz
解方程组(x+y)/xy=5/6,(y+z)/yz=-2/3,2(x+3)+xz=0
一道因式分解难题因式分解(y^2-z^2)(1+xy)(1+xz)+(z^2-x^2)(1+yz)(1+yx)+(x^2
计算∫∫ (2x+8z)dydz+(xy-xz)dzdx+(yz+2z)dxdy
一道初二分式计算题(2X+Z-Y)/(X^2-XY+XZ-YZ)-(2X+Y+Z)/(X^2+XY+XZ+YZ)
1.已知3x-4y-z=0,2x+y-8z=0.求x²+y²+z²/xy+yz+2xz 的
x^2+y^2+xy=25/4,x^2+z^2+xz=169/4,y^2+z^2+yz=36,求xy+xz+yz