On the left and right limits of higher numbers First, for example, greater than a is equal to an equation, less than a is equal to an equation, equal to a is a number, and then calculate the limit of the two equations less than and greater than a to make them equal Or can't we make the limits of the three formulas greater than a, less than a and equal to a equal?

On the left and right limits of higher numbers First, for example, greater than a is equal to an equation, less than a is equal to an equation, equal to a is a number, and then calculate the limit of the two equations less than and greater than a to make them equal Or can't we make the limits of the three formulas greater than a, less than a and equal to a equal?

Regardless of the one equal to a, the limit is to discuss the problem in a neighborhood, regardless of the value of that point, reaching means that it can not be equal to, but infinite reaching