4x+3y=4z 4x+y=2z 4x+4y=?
x=y/z=z/3,x+y+z =12,求2x+3y+4z是多少,
(4x-2y-z)-{5x[8y-2y-(x+y)]-x+(3y-10z)]=? kuai
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-
1.x+y=16,y+z=12,z+x=102.3x-y+z=4,2x+3y-z=12,x+y+z=63.x+y+z=6
x+y+z=2 4x+2y+z=4 2x+3y+z=1
解方程:{2x+3y+z=7,x+y+z=4,3x+y-z=-4
2x+5y+4z=6,3x+y-7z=-4,x+y-z=?
已知x:y:z=3:4:5,3x+2y-4z=18.求:x+y+z.
已知3x=4y,2y=5z,试求x:y:z
3x=4y 2y=5z 试求x:y:z
已知2x+5y+4z=6 3x+y-7z=-4求x+y-z
x-y+4z=10,x+3y+2z=2,x+2y+3z=11.