Lobida rule is a very effective and convenient method to find the limit of fractional infinitives. It is difficult to prove, which requires students to have a deep and correct understanding of the basic limits, except for mathematics majors. Convenient use does not mean correct use. If you don't understand infinitives, you can only use them indiscriminately, and you are self-righteous when you get the wrong result. Even if you understand the infinitive, you may "fail" in seeking the limit, but this does not necessarily mean the original.

L'H?pital's law does not apply to the college entrance examination, but it is the most basic law of higher mathematics in colleges and universities, and it is also the easiest to understand. High school teachers love to talk about L'H?pital's law, because it is very useful. Arguably, L'H?pital's law can't be deduced from the existing knowledge in senior high school, so it is reasonable to use L'H?pital's law without scoring in the college entrance examination, but this is not the case.

First of all, there are not many students who have time to do derivative questions in the college entrance examination. It is still troublesome to do derivative questions according to the knowledge learned in high school, but it will be different if you learn Robida's law. You can finish this derivative problem in a short time. As for whether to score, everyone should be clear.

Generally, high school papers are reviewed by university teachers, and the level of university teachers is still relatively high, so you should be very happy to see that the derivative questions on your papers are made by using L'H?pital's law. After all, there are not many students who can do derivative problems, not to mention the university knowledge of L'H?pital's Law. So for some spare students, it is very important to learn L'H?pital's law. When you make the correct answer, even if the marking teacher doesn't give you full marks, one or two points will be deducted at most.