如果x/2=y/3=z/5,且xyz不等于0,则(x+y+z)/（3x-y）,

如果x/2=y/3=z/5,且xyz不等于0,则(x+y+z)/（3x-y）, 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 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:(x+y)/z=(x+z)/y=(z+y)/x,且xyz不等于0,则分式(x+y)(x+z)(z+x)/xyz的值 若xyz不等于0,且|2x+3y-z|+(3x-y-z)^=0,则代数式z分之x+y= 已知方程组4x-y+3z=0,2x+y+6z=0.且xyz不等于0,则x:y:z= 若3分之x+y=5分之y+z=4分之z+x,且xyz不等于0,则x：y：z= 若xyz不等于0,且{4x-5y+2z=0,x+4y-3z=0,求x:y:z 已知xyz不等于0,且x/3=y/4=z/5,求【2x-3(2y-z)】/x+y+z 已知4x-5y+2z=0,且x+4y-3z=0,(xyz不等于0）试求x/y 如果｛x+2y-8z=0 2x-3y+5z=0,其中xyz不等于零,那么x+y/z= 若xyz不等于0,且满足(y+z)/x=(x+z)/y=(x+y)/z,求（y+z)（x+z)（x+y)/xyz的值