1+x/(2-x)=2m/(x^2-4)
1+x/(2-x)+2m/(4-x^2)=0
(4-x^2+2x+x^2+2m)/(4-x^2)=0
(4+2x+2m)/(4-x^2)=0
x=-m-2≠±2
m≠-2±2
0.2x<0.3x+1
-x<10
x>-10
2(x-3)≥x-8
x≥-2
所以x≥-2
x=-m-2≥-2
m≤0
又m≠-2±2
所以-4≠m<0.
1+x/(2-x)=2m/(x^2-4)
1+x/(2-x)+2m/(4-x^2)=0
(4-x^2+2x+x^2+2m)/(4-x^2)=0
(4+2x+2m)/(4-x^2)=0
x=-m-2≠±2
m≠-2±2
0.2x<0.3x+1
-x<10
x>-10
2(x-3)≥x-8
x≥-2
所以x≥-2
x=-m-2≥-2
m≤0
又m≠-2±2
所以-4≠m<0.