mx平方+m-2=2mx-x平方
(m+1)x^2-2mx+m-2=0
1)
m+1≠0,m≠-1
△=4m^2-4(m+1)(m-2)=4m+8>0
m>-2
m的取值范围:m>-2,m≠-1
2)
x1,2=(m±√(m+2))/(m+1)