已知4x-3y-6z=0,x+2y-7z=0,xyz≠0,求x-y+2z/x+y-zx-y+2z分之x+y-z

已知4x-3y-6z=0,x+2y-7z=0,xyz≠0,求x-y+2z/x+y-zx-y+2z分之x+y-z
已知4x-3y-6z=0,x+2y-7z=0,xyz≠0,求x-y+2z/x+y-z
x-y+2z分之x+y-z

已知4x-3y-6z=0,x+2y-7z=0,xyz≠0,求x-y+2z/x+y-zx-y+2z分之x+y-z
将方程组改写为
4x-3y=6z,x+2y=7z
也就是把z视为常数,解二元一次方程组
得x=3z,y=2z
代入(x-y+2z)/(x+y-z)=3/4
话说x-y+2z分之x+y-z应该写作(x+y-z)/(x-y+2z)
你的分子分母究竟是?这个应该很容易,你自己看吧
如果分子是x+y-z,分母是x-y+2z
也就是说整个分子式是(x+y-z)/(x-y+2z)的话答案就是4/3,也就是三分之四