已知:x-y+z=0,2x-3y-4z=0,且xyz≠0,求x+y+z/x+y-2z的值求大神帮助
问题描述:
已知:x-y+z=0,2x-3y-4z=0,且xyz≠0,求x+y+z/x+y-2z的值求大神帮助
答
根据前两个式子可得x=-7z,y=-6z 所以等式=49z+36z+z/49z+36z-2z=86/83
已知:x-y+z=0,2x-3y-4z=0,且xyz≠0,求x+y+z/x+y-2z的值求大神帮助
根据前两个式子可得x=-7z,y=-6z 所以等式=49z+36z+z/49z+36z-2z=86/83