快已知方程组;x+y-7z=0 3x-2y-z=0,且z≠0,求x:y:z加减消元法
快已知方程组;x+y-7z=0 3x-2y-z=0,且z≠0,求x:y:z加减消元法
已知方程组{x+y-7z=0,3x-2y-z=0,且z≠0,求X:Y:Z
已知:(x+y-z)/z=(x-y+z)/y+(y+z-x)/x,且xyz≠0,求代数式[(x+y)(y+z)(x+z)
已知x、y、z满足方程组:x+y-z=6;y+z-x=2;z+x-y=0 求x、y、z的值
已知x+y-z/z=x-y+z/y=-x+y+z/x,且xyz不等于0,求分式[(x+y)(x+z)(y+z)]/xyz
已知方程组2x-3y-4z=0和x+y+z=0,并且z≠0,求x:y与y:z
已知方程组4x-y+3z=0 2x+y+6z=0且xyz不等于0,则x/y+y/z+z/x是多少
已知方程组3x+5y+3z=0,3x-5y-8z=0,并且z≠0,求x:z和y:z
已知方程组x-3y-2z=0 2x-y+z=0 且xyz≠0,求x:y:z
1.已知关于x、y的方程组3x-4y-z=0,2x+y-8z=0,且z≠0,求x/z和y/z的值
已知x,y,z满足方程组{x+y-z=6{y+z-x=2{z+x_y=0,求x,y,z的值
已知x,y,z均不为0,且满足方程组x+y-z=0,2x-y-5z=0试求2x+y+3z/3x-y-z