4x-3y-6z=0,x+2y-7z=o,且xyz不等于0求3x+2y+z\x+2y+3z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 4X—3Y—6Z=0 X+2Y—7Z=O（XYZ不等于0）求代数式X-y+z除以x+y+z的值 已知xyz不等于0,且x+2y-z=0,7x-y-z=0,求x+y+z/2x-y-z的值. 若xyz不等于0,且x+2y-7z=0,4x-3y-6z=0,求x+2y+z/x-2y-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 方程组:x-2y+4z=0,2x+3y-3z=0...xyz不等于0,求(2x+y-z)\(2x-y+z) 数学题用2元1次解已知道4X-3Y-6Z=0 X+2Y-7Z=0且XYZ都不等于0,求X+2Y+3Z分之3X+2Y+Z的 已知2X+5Y+4Z=0,3X+Y-7Z=0,且XYZ不等于0,求（X+Y+Z）/(2X-3Y+4Z)的值 若xyz不等于0,且满足(y+z)/x=(x+z)/y=(x+y)/z,求（y+z)（x+z)（x+y)/xyz的值 若xyz不等于0,且(y+z)/x=(z+x)/y=(x+y)/z,求(y+z)(z+x)(x+y)/xyz的值? 已知xyz满足|3x-2y+z|+|2x+y+2z|=0（xyz不等于o）求x+y除以z