请用行列式解线性方程组：{-x+2y-3=0 {x+y+3z=0 {3x-2y+z+2=0 .前面是大的{这个符号.急.

4x-3y-6z=0,x+2y-7z=0是一个方程组,那么x-y+z/x+y+z的值等于 已知x^3+y^3-6x+2y+z+3+10=0,求（x-y+z)(x+y-z)的值.（z+3)是绝对值 已知x,y,z 大于0,x+y+z=2,求证 xz/y(y+z)+zy/x(x+y)+yx/z(z+x)大于等于2/3 如果|x+y+z-6|+|2x+3y-z-12|+|2x-y-z|=0求x,y, 设X+Y+Z=0求X^3+X^2Z-XYZ+Y^2Z+Y^3的值 若x/2=y/3=z/4不等于0,求x+y+z/x+y-z的值 2x+2y+z=0 ,3x+5y+z=0,那么x+2y/x+y+z的值是 解方程组{2x+3y+z=11,x+y+z=0,3x-y+z=-2. 解三元一次方程：x+y-z=0,2x+y+z=7,x-3y+z=8 已知x+y-z=0,2x-y+2z=0 求（3x-2y+5z)/(5x-3y+2z)的值 已知4x-3y+z=0,x+2y-8z=0,xyz不等于0,求x+y-z/x-y+2z的值 已知x+4y+3z=3x-2y-5z=0,求x+2y-z/2x-3y+7z的值