已知x/3=y/5=z/7不等于0,则x-y+z/y=?

已知x/3=y/5=z/7不等于0,则x-y+z/y=? 已知x/3=y/5=z/7不等于0,则2x+3y+4z/5x-3y+z=? 已知x/3=y/5=z/7不等于0,求x-y+z/y的值 已知xyz不等于0,且{x+3y+5z=0 x2+3y+z=0,则x.x+y.y-2z.2z/3x.3x+2y.2y+z.z=? 已知4x-3y-3z= 0,x-3y+z=0中x,y,z不等于0,则x:y:z为? 已知x+y-7z=0 x-2y+5z=0(xyz不等于0）,求x+2y-z/y-2x+12z 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5分之X+Y=6分之Y+Z=7分之x+z,且X,Y,Z都不等于0,求X:Y:Z的值 已知x,y,z满足方程组x-2y+z=0 7x+4y-5z=0,且z不等于0,2x²-3y²+z²/y²-2z²的值为? 已知｛5x-4y-29z=0 x-3y+3z=0 其中z不等于0,则x；y= 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的值为? 一已知方程组x-3y+7z=0和x-2y+4z=0 (xy不等于0),则x比y比z 已知X+4Y-3Z=0,4X-5Y+2Z=0(XYZ不等于0) 则X:Y:Z=_____ 已知x+4y-3z=0,4x-5y+2z=0(xyz不等于0),则x:y:z=? 已知xyz不等于0,x+3y+z=0,2x+3y-z=0,则x+2y-7z / 3x+5y+z的值为___? 已知xy/5=y+z/6=z+x/7,且xyz不等于0,求x:y:z 已知z不等于0,x、y、z满足4x-7y-5x=0,2x-y-z=0.求x：y 已知4x-3y-6z=0,x+2y-7z=0(xyz不等于0)则2x方+3x方+6x方/x方+5y方+7z方的值为( )