Restriction; Restrict. Limit is the limit in mathematics. Question: Do you understand lim's calculation? Answer: 1. Factorization is generally used to remove the denominator from zero. 2. If the numerator or denominator has roots, it can be multiplied by the number of upper and lower yokes to remove the roots. 3. If the score is 0/0 or ∞ /∞, Robey is used. If the formula [f (x)] x = e XLNF (x) is used instead, L 'Bida Law 5 can be used instead. Sometimes, in order to change the original formula into fractional form, T = 1/Y can be used instead, and L 'Bida Law 6 can also be used. For example, L 'Bida's law can be used to calculate bounded quantities, such as lim [