Let u = R, a = {x | 1 / X

Let u = R, a = {x | 1 / X


1/x



Let u = R, if a = {x | 1 / x > = 1}, then CUA =?


From 1 / x > = 1, we know that x must be a positive number, so we multiply X by the inequality invariant sign on the right side of the equal sign to get X



Let u = R, a = {x | x ≥ 1} u {x | x ≤ 0}, then CUA =, is a process


In R, if XX ≥ 1 is removed, then x ≤ 0 is removed, and the rest is 0