|2x+4y|+(y+3z)^4=0 这道题谁会,即急!
已知x/3=y/5=z/4,求x+y+z/y和x+y-z/y-x的值,2种方法.急等.
1.已知x:y:z=4:5:7,求:(一)2x+3y+z/5z; (二)x+y/y+z 非常急,
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-
①x+y+z=6 3x-y+2z=12 x-y-3z=-4 ②x+y-z=2 4x-2y+3y+8=0 x+3y-2z-
三元一次方程4X+3Y+2Z=40 3X+2Y+5Z=22 6Z-5Y+3Z=50急
x-3y+z=0,3x-2y-4z=0,则x:y:z=多少?
已知{x-3y+2z=0 3x-3y-4z+0,则x:y:z=?
2x+5y+4z=0,3x+y-7z=0,则x+y-z=?
x+2y-4z=0 3x+y-z=0,则x:y:z=
x+2y-4z=0,3x+y-z=0,则x:y:z=?::
x+y+z=4 x-2y+z=-2 x+2y+3z=0求解
已知方程组4x-5y+2z=0 x+2y=3z 则x:y:z