解方程组xy/x+y=2yz/y+z=4zx/z+x=5

Question

解方程组xy/x+y=2 yz/y+z=4 zx/z+x=5

Answer 1

是"xy/(x+y)=2,yz/(y+z)=4,zx/(z+x)=5"吗?
1/x+1/y=1/2,1/y+1/z=1/4,1/z+1/x=1/5,
1/x+1/y+1/z=19/40,
1/x=9/40,x=40/9,
1/y=11/40,y=40/11,
1/z=-1/40,z=-40.