已知x/3=y/4=z/5,则(x+4y+2z)/（8x+y+6z）=

已知(x+2y)/3=(y+3z)/4=(z+5x)/5,则x:y:z= 已知x+2y/3=y+3z/4=z+5x/5,则x:y:z=? 已知x+2y/3=y+3z/4=z+5x/5,则x:y:z= 已知x+4y-3z=0,4x-5y+2z=0,则x：y：z 已知x+4y=3z,4x-5y=-2z,则x:y:z 已知x+y=3,当y+z=4,x+z=5,则x+y+z等于() 已知2x+5y+4z=15.7x+y+3z=14 则x+y+z=? 已知方程组4x-5y+2z=0 x+2y=3z 则x:y:z 已知3X=4X,5Y=6Z求X+Y：Y+Z 已知：4x-5y+2z=0 x+4y-3z=0则：(x*x+y*y+z*z)/(x*y+y*z+z*x)=____. 已知关于x y z的方程组2x-3y+5z=7 x+2y-3z=8,则4x+y-z= (x+y):(y+z):(z+x)=3:4:5 3x+y-z=-4已知(x+y):(y+z):(z+x)=3:4:5 ；3x+y-z=-4求x y z 已知x:4=y:5=z:6.则x:y:z= (x+y):(y+z)= 已知x+4y-3z=0；4x-5y+2z=0,则3y-5z分之2x-y+3z=? 已知{x+4y-3z=0,4x-5y+2z=0,则2x-y+3z分之3y-5z=? 已知x/4=y/5=z/6则（x+y)(y+z)= 已知5x=3y,4z=7y,求x:y:z 已知x /3=y /4=z /5,则x+y / x-2y+3z的值为?