6x-y-z=3 2x-4y+8z=5 3x-6y-z=10 y z 分别等于几?大虾

(4x-2y-z)-{5x-[8y-2z-(x-2y)]-x-(3y-10z)}=? 三元一次方程组2x+z=3 3x+y-z=8 x+3y+2z=3 5x+2y-3z=2 x+2y+z=6 7x-2y-4z=262x+z=3 3x+y-z=8 x+3y+2z=3 5x+2y-3z=2 x+2y+z=6 7x-2y-4z=26 6x-y-z=3 2x-4y+8z=5 3x-6y-z=10 y z 分别等于几?大虾 (4x-2y-z)-{5x-[8y-2z-(x+y)]-2(3y-10z)}=?好难啊 已知x-y/x+y=y+z/2(y-z)=z+x/3(z-x),求证8x+9y+5z=0THX.. x:y:z=3:4:5 2x-3y+2z=8 x-y-2z=? 三元一次方程 X+Y+Z=6 2X+3Y-Z=4 3X-Y+Z=8 x-y+z=-1 5x+2y-z=6 4x-3y+2z=-5 x+y+z=-1 4x-2y+3z=5 y-z=8-2x 2x+5y+4z=6,3x+y-7z=-4,x+y-z=? {2x+3y-4z=-5 x+y+z=6 x-y+3z=10 解方程组x+y+z=6 x+2y-3z=4 2x-y+z=5 x+y+z=1 4x+5y-z=6 x+2y-z=3 解方程组：x+y+z=4,x+y+2z=5,3x+y-z=6 已知2x+5y+4z=6 3x+y-7z=-4求x+y-z ①x+y+z=6 3x-y+2z=12 x-y-3z=-4 ②x+y-z=2 4x-2y+3y+8=0 x+3y-2z-6=0③x/3=y/2 y/4=z/5 x+y+z=60三元一次方程 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.