已知2x-3y+z=o,3x-2y-6z=0,xyz≠0,求x^2+y^2+z^2/2x^2+y^2-z^2的值
问题描述:
已知2x-3y+z=o,3x-2y-6z=0,xyz≠0,求x^2+y^2+z^2/2x^2+y^2-z^2的值
答
z=3y-2x
y=3/4x
所以:x^2+y^2+z^2/2x^2+y^2-z^2可化成
10/16x^2 /(5/2x^2)=1/4