已知x/y=2,x/z=4,z=1,求代数式x+y+z/x-y-z好像是写错了，是x+y+z/x-y+z

Question

已知x/y=2,x/z=4,z=1,求代数式x+y+z/x-y-z
好像是写错了，是x+y+z/x-y+z

Answer 1

x/y=2,x/z=4,z=1
则x=4,y=8
x+y+z/x-y-z=4+8+1/2-4-1=35/3
怀疑你问题写错了……
(x+y+z)/(x-y-z)=(2+4+1)/(2-4-1)=-7/3