2道初中反比例函数题,

1.设Y1=kx,Y2=m/(x-2)
则Y=kx+m/(x-2)
把x=1,y=1;x=3,y=5分别代入,得
{k-m=1
3k+m=5
解得k=3/2,m=1/2
Y=3/2*x+1/2(x-2)
把x=5代入y=3/2*5+1/2(5-2)=15/2+1/6=23/3
2.x^2-4x+|y-3|+4=0
(x-2)^2+|y-3|=0
x-2=0,y-3=0
x=2,y=3
把x=2,y=3代入y=k/x
k=6
此函数解析式为y=6/x