1+(x)/(2-x)=2m/(x^2-4)
1-(x)/(x-2)=2m/(x^2-4)
(x-2-x)/(x-2)=2m/[(x-2)(x+2)]
-2(x+2)=2m
x=-m-2
x不等于2和-2
所以m不等于0和-4
(1-x)/2>x-2
1-x>2x-4
x