已知4x-5y+2z=0,且x+4y-3z=0,(xyz不等于0）试求x/y

已知x/2=y/3=z/4,且x+y+z不等于0,求2x+3y-4z/x+y+z的值 已知x/2=y/3=z/4,且x+y+z不等于0,求2x+3y-4z/x+y+z的值 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x.y.z满足x-2y+z=0且7x+4y-5z=0,求x:y:z的值 已知x,y,z满足方程组x-2y+z=0 7x+4y-5z=0,且z不等于0,2x²-3y²+z²/y²-2z²的值为? 已知4x-3y-6z=0,x+2y-7z=0,且x,y,z≠0,求2x+3y+6z/x+5y+5z的值. 三元一次方程组题目x+y-z=11 y+z-x=5 x-y+z=1x+y=4 y+z=3 x+z=5若已知x-3y+2z=0 2x+3y-8z=0, 且xyz≠0,则x:y:z= 已知4x-5y+2z=0,x+4y-3z=0 且xyz不等于0,求x:y:z的值. 已知方程组4x-5y+2z=0,且x+4y=3z,则x:y:z=? 已知xyz不等于0,且x/3=y/4=z/5,求【2x-3(2y-z)】/x+y+z 已知x,y,z都不为0,且满足4x-3y-3z=0,x-3y+2z则,x:y: 已知x:y:z=2:3:4,且x-y+z=36,求x+y+z的值. 已知x:y:z=2:3:4且x+z-y=36求x+y+z的值 已知x:y:z=2:3:4,且x+z-y=36.求x+y+z的值 已知x:y:z=2:3:4,且x+y+z=18.求x、y、z的值. 已知3x-4y-z=0.2x+y-z=0,且xyz=0,求x+2y-3z/3x-2y+3z3x-4y-z=零点二x+y-z=0 已知方程组{4x-3y-6z=0 x+2y-7z=0 且z≠0,则（x+y+3z）÷（4x-y-5z）=?结果和思路! 已知2x-3y-z=0,x+3y-14z=0,且z≠0,求4x-5y+z/x+y+z的值 快 用二元一次方程