已知3x=4Y,5Y=6Z,求 (1)x:y:z;(2)x+y/y+z
已知x::y:z=3:4:5,(1)求x+y分之z的值;(2)若x+y+z=6,求x,y,z.
已知2x+5y+4z=6 3x+y-7z=-4求x+y-z
已知x/4=y/5=z/6 求x+y+z/3x-2y+z的值
已知x/4=y/5=z/6,求x+y+z/3x-2y+z的值.
已知3X=4X,5Y=6Z求X+Y:Y+Z
已知3x=4Y,5Y=6Z,求 (1)x:y:z;(2)x+y/y+z.
已知3x=4Y,5Y=6Z,求 (1)x:y:z;(2)x+y/y+z
已知3x=4y,2y=5z,试求x:y:z
已知x:y:z=4:5:7,求:(1)2x+3y+z/5z; (2)x+y/y+z.
已知x:y:z=3:4:5,3x+2y-4z=18.求:x+y+z.
已知3x-2y-5z=0,2x-5y+4z=0,且x,y,z均不为0,求3x*x+2y*y+5z*z/5x*x+y*y-
已知x+4y+3z=3x-2y-5z=0,求x+2y-z/2x-3y+7z的值