2x-3y+4z=2,4x+y+7z=3,8x-2y+3z=-5的解是什么?
已知x+4y+3z=3x-2y-5z=0,求x+2y-z/2x-3y+7z的值
方程组2x+4y+3z=9,3x-2y+5z=11,5x-6y+7z=13的解是什么
x-y-z=-1,3x+5y+7z=11,4x-y+2z=-1.方程组的解是什么?
(4x-2y-z)-{5x[8y-2y-(x+y)]-x+(3y-10z)]=? kuai
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.
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.
解方程:{2x+3y+z=7,x+y+z=4,3x+y-z=-4
{x+y+z=1;x+3y+7z=-1;z+5y+8z=-2
2x+5y+4z=6,3x+y-7z=-4,x+y-z=?
解方程组:x+y+z=4,x+y+2z=5,3x+y-z=6