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

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 4X—3Y—6Z=0 X+2Y—7Z=O（XYZ不等于0）求代数式5X方+2Y方—Z方除以2X方—3Y方—10Z方的值 已知xyz满足|3x-2y+z|+|2x+y+2z|=0（xyz不等于o）求x+y除以z 已知4x-3y+z=0,x+2y-8z=0,xyz不等于0,求x+y-z/x-y+2z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? 若xy-z不等于0,且(y+x)/x=(z+x)/y=(y+x)/z,求[(y+z)(z+x)(x+y)]/xyz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xyz不等于0,且x+2y-z=0,7x-y-z=0,求x+y+z/2x-y-z的值. 4x－3y－6z＝0,x＋2y－7z=0,xyz的积不等于0,求（x＋y－z）／（x－y＋2z）的值 已知:(x+y)/z=(x+z)/y=(z+y)/x,且xyz不等于0,则分式(x+y)(x+z)(z+x)/xyz的值 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)