2x+( 1/x-3)= 6+2(x-3)+ 1/(x-3)≥6+2√2
19. If the solution set of m is not equal to MX 2-(2m+1) x+m-1≥ 0, what is the value range of m?
When m=0, a linear function always has a solution.
When m≠0, discriminant < 0, (2m+ 1) 2-4m (m- 1) < 0, m.
∴m∈(-∞,- 1/8)
20. Solve the following inequalities
( 1)-2x+x-5 & lt； 0
-x & lt； five
x>-5
(2)25-x^2>； 0
x^2