3x-2y+z=4 x+y-z=5 4x-4y+3z=27
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
求解三元一次方程组:{x+y/2=y+z/3=z+x/4 x+y+z=27
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.
{2x+3y-4z=-5 x+y+z=6 x-y+3z=10
已知2x+5y+4z=6 3x+y-7z=-4求x+y-z
2x+5y+4z=0,3x+y-7z=0,则x+y-z=?
解方程组:x+y+z=4,x+y+2z=5,3x+y-z=6
已知2x+5y+4z=15.7x+y+3z=14 则x+y+z=?
x/3=y/4=z/5,求x+y+z/3x-2y+z的值,
若x/3=y/4=z/5,求x+y+z/3x-2y+z的值.