z = 6x - 5y

x+y+z=4x-5y=y-x+6z,xyz不等0,x:y:z=? 6x+5y+3z=100 x+y+z=30 求 x y 已知3X=4X,5Y=6Z求X+Y：Y+Z 若X:Y:Z=5:6:7那么(Y-X):(Y+Z)和(X+2Y+3Z):(3X+2Y+Z) 解方程组3x+y+z=6,x+3y+z=5,x+y+3z=9｛3x+y+z=6｛x+3y+z=5｛x+y+3z=9 x/3=y/6=z/8 3x+5y-6z=-18 求x,y,z x-y+z=-1 5x+2y-z=6 4x-3y+2z=-5 2x+5y+4z=6,3x+y-7z=-4,x+y-z=? 3x+y+z=6 x+3y+z=5 x+y+3z=9 x+y+z=1 4x+5y-z=6 x+2y-z=3 解方程组x+y+z=6 x+2y-3z=4 2x-y+z=5 {2x+3y-4z=-5 x+y+z=6 x-y+3z=10 解方程组：x+y+z=4,x+y+2z=5,3x+y-z=6 y+z-3x=3z+x-3y=5x+y-3z=6 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 若x:y:z=3:4:5=6,求x-y+z分之x+y-z的值 已知x/4=y/5=z/6,求x+y+z/3x-2y+z的值.