因式分解 -64x^2y^2z-32xy^3z+48xy^2z^2

因式分解x²-y²-z²+2xy 化简(y-x)(z-x)/(x-2y+z)(x+y-2z)+（z-y)(x-y)/(xy-2z)(y+z-2x)+(x- 1.x-z/xy - 2ab/xy (2X+Z-Y)/(X^2-XY+XZ-YZ)-(Y-Z)/(X^2-XY-XZ+YZ) 因式分解x^2+y^2+z^2+2xy+2yz+2xz-2x-2y-2z+1 实数x、y、z满足x=6-3yx+3y-2xy+2z 证明 (x+y+z)^2>3(xy+yz+zx) -2x²y（3xy²z-2y²z) -2x²y(3xy²z-2y平方z) 已知x>0,y>0,z>0,证明x^3/(x+y)+y^3/(y+z)+z^3/(z+x)≥(xy+xz+yz)/2 已知X:Y:Z等于3:4:5,求2XY-3XY+Z的平方除以X平方减2XY减Z平方 设函数z=z(x,y)由方程e^(-xy)-2z+e^z=0确定,求z/x,z/y