已知x-2y+z=0,3x+6y-z=0(xyz≠0),求2x²+y²/x²+y²

已知x-2y+z=0,3x+6y-z=0(xyz≠0),求2x²+y²/x²+y² 已知：(x+y-z)/z=(x-y+z)/y+(y+z-x)/x,且xyz≠0,求代数式[(x+y)(y+z)(x+z) 已知x+y-z/z=x-y+z/y=-x+y+z/x,且xyz不等于0,求分式[(x+y)(x+z)(y+z)]/xyz 已知有理数x,y,z满足(x-z-2)²+(3x-6y-7)+|3y+3z-4|=0,则xyz= 已知4x-3y+z=0,x+2y-8z=0,xyz不等于0,求x+y-z/x-y+2z的值 已知XYZ满足方程组 X+Y-Z=6 Y+Z-X=2 Z+X-y=0 求X Y Z的值 已知2x-3y+z=0,3x-2y-6z=0且xyz≠0求2x²+y²-z²分之x 已知x²+y²+z²-2x+4y-6z+14=0,求x+y-z/x+y+z的值 已知x,y,z满足x+y+2z=1,x²+y²+6z+1.5=0,求x,y,z的值 数学题已知xyz≠0,且x+y+z=1,x²+y²+z²=1,求1/x+1/y+1/z的值 已知x²+y²-6x+2y+|z+3|+10=0,求x+z-y的值 已知方程组4x-y+3z=0 2x+y+6z=0且xyz不等于0,则x/y+y/z+z/x是多少