【1】 2x-5y+11=0 7y+4z-5=0 5x+2z-2=0 【2】 x-y=1 x+y+
2x+5y+4z=0,3x+y-7z=0,则x+y-z=?
x-y-z=-1 3x+5y+7z=11 4x-y+2z=-1 分别求出x=?y=?z=?
已知x+4y+3z=3x-2y-5z=0,求x+2y-z/2x-3y+7z的值
已知3x-2y-5z=0,2x-5y+4z=0,且x,y,z均不为0,求3x*x+2y*y+5z*z/5x*x+y*y-
若4x-3y-6z=0,x+2y-7z=0,求代数式5x*5x+2y*2y-z*z/2x*2x-3y*3y-10z*10
已知方程组4x-5y+2z=0 x+2y=3z 则x:y:z
{5x-3y+z=2{5x+2y-4z=3{-5x+y-z=2 {x-y-z=-1{3x+5y+7z{4x-y+2x=-
已知3x-2y-5z=0,2x-5y+4z=0,且x,y,z都不为0,求(3x*x+y*y+4z*z)/(5x*x+y*
已知x+y-7z=0 x-2y+5z=0(xyz不等于0),求x+2y-z/y-2x+12z
已知2x+2y-4z=0,2x+4y+5z=0,求x+y+z/x-y+z的值
已知x.y.z满足方程组x+2y-4z=0 2x+y-5z=0 求x:y:z的值
已知{3x+4y+5z=0,2x+3y-4z=0,求x+y+z/x-y+z的值.