6x^2-5xy-6y^2-2xz-23yz-20z^2 因式分解

6x^2-5xy-6y^2-2xz-23yz-20z^2 因式分解 因式分解:6x^2-5xy+6y^2-xz-23yz-20z^2 (2X+Z-Y)/(X^2-XY+XZ-YZ)-(Y-Z)/(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+y+zRt 6x^2-5xy-6y^2-2xz-23yz-20z^2=_______ 已知x:4=y:5=z:6,求x^2+y^2-z^2/xy+xz+yz 解方程组（x+y)/xy=5/6,(y+z)/yz=-2/3,2(x+3)+xz=0 函数u(x,y,z)=4xy^3+5x^2y^6+xz的全微分du 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) 分解因式x^2+3xy-10y^2-x+9y-26x^2-15y^2-6z^2-xy-5xz+21yz 6x^2-13xy+6y^2+8xz-2yz-8z^2因式分解 6X^2-7xy-3y^2-xz+7yz-2z^2因式分解, 6x^2-7xy-3y^2-xz+7yz-2z^2 2X^2-6y^2+3z^2-xy+7yz+7xz因式分解 因式分解 3x^2-11xy+6y^2-xz-4yz-2z^2 因式分解:x^2-6y^2-12z^2+xy-xz+17yz 求(2X+Z-Y)/(X^2-XY+XZ-YZ)-(2X+Y+Z)/(X^2+XY+XZ+YZ) X²-2xy-xz+yz+y²因式分解