(x-3)/(x-1)
=(x-1-2)/(x-1)
=x-1-[2/x-1]
值是整数
2/x-1是整数
x=3,-1,0,2=(x-1-2)/(x-1)=x-1-[2/x-1]这两部没看懂，能再详细些么。(x-3)/(x-1)=(x-1-2)/(x-1)=(x-1)/(x-1)-[2/x-1]=1-[2/x-1]上面打错了x-1-[2/x-1]中的x-1该是1