{x-z-y=0 x+y-3z=4 2x-5y+7z=21,不写步骤老师要说的,
{x-z-y=0 x+y-3z=4 2x-5y+7z=21,不写步骤老师要说的,
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-
已知4x-3y-6z=0,x+2y-7z=0,且x、y、z都不为0,求(3x+2y+z)/(x+2y+3z)的值 快帮求
已知4x-3y-6z=0 ① ,x+2y-7z=0 ②,且x,y,z均不为0,求3x+2y+z÷x+2y+3z的值
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*
2x+5y+4z=0,3x+y-7z=0,则x+y-z=?
已知{3x+4y+5z=0,2x+3y-4z=0,求x+y+z/x-y+z的值.
已知2x+3y-4z=0,3x+4y+5z=0,求x+y+z/(除以)x-y+z的值.
已知2x+3y-4z=0,3x+4y+5z=0,求x+y+z/x-y+z的值.
2x+3y-4z=0,3x+4y+5z=0,求x+y-z/x-y+z的值
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