已知x:y:z=3:4:5,x+y+z=36,则x+1/4y+z的立方根是多少

(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3X=4X,5Y=6Z求X+Y：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+2y/3=y+3z/4=z+5x/5,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X+Y=3,Y+Z=4,Z+X=5,求Z,X,Y的值. 已知{x-5y+2z=0 3x-5y-4z=0,求x：y:z 已知2x+5y+4z=6 3x+y-7z=-4求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:Z=3:4:5,求4X+3Y-2Z/X+Y+Z的值 已知x/4=y/5=z/6 求x+y+z/3x-2y+z的值 已知方程组4x-5y+2z=0 x+2y=3z 则x:y:z 已知x/4=y/5=z/6,求x+y+z/3x-2y+z的值. 已知(x+y)/3=(y+z)/4=(z+x)/5,求x比y比z 已知x-y/x+y=y+z/2(y-z)=z+x/3(z-x),求证8x+9y+5z=0THX..