Knock knock!

Fang Ding and Li Chenglong came to Li Chenglong's home. Li Chenglong's family situation is not bad, it is a small unit building.

As the doorbell rang, the doorknob of the anti-theft door in front of the two suddenly turned, and a middle-aged woman with a tight apron opened the door with a smile!

"It's back!"

The middle-aged woman's voice was very soft, and Fang Ding followed Li Chenglong in.

"Mom, this is my classmate Fang Ding!" Li Chenglong casually put his schoolbag on the sofa and couldn't wait to introduce it to the middle-aged woman.

This middle-aged woman is Li Chenglong's mother!

"Hello Auntie!" Fang Ding showed a smile full of youthful sunshine and vitality, and greeted Li Chenglong's mother.

"Xiao Ding! You're here, I've told our family Jackie Chan many times, learn more from you, the first in the school, this is amazing! In the future, it is also a talent of Imperial Capital University! ”

Li Chenglong's mother's admiration never stopped when she spoke, and from time to time she glanced at Li Chenglong from the corner of her eye.

In the afterglow, there is a trace of loss, a trace of hope, and two contradictory emotions.

Loss is definitely inevitable, which parent is not looking forward to Jackie Chan. What's more, the name Li Chenglong, as long as the brain is a little normal, you know what this name means.

However, that glimmer of hope made Fang Ding understand the hearts of parents all over the world. No one will give up on their children, even one in ten thousand hopes.

"Xiao Ding! You have to make up for Jackie Chan, you make up for it, Auntie, don't worry! Li Chenglong's mother said, so she pulled Fang Ding, called Li Chenglong by the way, and came to the dinner table.

At the dinner table, the meal was extremely rich, with lobster, hairy crab, a pot of seafood soup, and a few side dishes.

"Auntie doesn't have anything to entertain you, so let's entertain you with homely meals! But you must make up for Jackie Chan and leave him behind

and make it all back.

”

Li Chenglong's mother, three sentences of non-departing from the make-up class, it can be seen that she cares deeply about Li Chenglong.

"Don't worry, Auntie, I will definitely make up for him, and in the next exam, I will directly let him enter the top 100." Fang Ding patted his chest and assured him.

After the cup and plate were messy, Fang Ding burped with satisfaction, and I have to say that Li Chenglong's mother's craftsmanship is absolutely good.

It's just that Li Chenglong's mother said just now that this is just a simple meal.

Fang Ding showed a suddenly realized gaze, and his face was full of expressions!

"Fatty, no wonder you're so fat!" Fang Ding and Li Chenglong have come to Li Chenglong's bedroom.

Li Chenglong was in his schoolbag, ready to take out the textbooks and exercises he used tonight, while Fang Ding also looked at Li Chenglong's room casually.

In my memory, although Fang Ding and Li Chenglong have a good relationship, Fang Ding has never been to Li Chenglong's home.

This time, it's the first time!

"Brother Ding, let's start!" Li Chenglong first took out a major subject in high school, and among all the major subjects, the difficulty of mathematics is no less than that of science comprehensive!

Fang Ding took a look and found that Li Chenglong took the math paper first, this paper was the test question from the last school-wide joint exam.

Fang Ding didn't know why, and asked, "Fatty, what did you do with the paper last time?" ”

In the last math exam, except for Fang Ding, no one had a perfect score, and the difficulty was too great.

"Rumor has it that the last test paper was written by the Red Devil, and everyone only did half of it at most!

"Whew!"

Fang Ding let out a long breath of turbid air, and he adjusted his emotions. In his opinion, the mathematics test paper of the last school-wide alliance cannot be simpler, and the basic cannot be more basic.

Casually in the heavens and all worlds of science and technology cultivation of true literary name national costumes, two or three-year-old children, learning is this foundation.

Even, it is more than ten times stronger than this foundation.

"What don't you understand?" Fang Ding asked directly and categorically. If Li Chenglong asks questions one by one, it will not only waste time, but also fail to find the gaps in Li Chenglong's body in a targeted manner and make up for them directly and effectively.

Li Chenglong took out the math test paper, and Fang Ding took it directly. In the mathematics test paper with a full score of 150 points, Li Chenglong scored 95 points.

Ninety-five points, hovering on the edge of the passing line!

However, Fang Ding took a serious look at Li Chenglong's test paper and found that the more he went on, the more complicated and difficult the questions to solve, Li Chenglong found and answered them, and his ideas were very clear.

However, the further you go, the simpler the topic is, and the more mistakes Li Chenglong makes!

For example, given the three unknowns a, b, and c, it is proposed that if the letter a is greater than the letter b is greater than the letter c, ask, among the following four options, the description is correct.

This is the third question in the multiple-choice question!

In college entrance examination mathematics, multiple-choice questions can almost be said to be sent-score questions, as long as you get full marks for multiple-choice questions and fill-in-the-blank questions, more than half of the scores will be in hand.

"What was your idea at the time?" Fang Ding pointed to the third question and asked Li Chenglong directly.

The simpler the question, the more wrong it is, and there are only two cases. First, if the foundation is not solid, small knowledge points may be habitually ignored, leading to mistakes in simple questions.

Second, there are too many conditions to consider, which leads to confusion in the mind and leads to mistakes.

"I ......" Li Chenglong looked at the third question and recalled.

"I remember thinking about four options together, and each of them contained a part of the others. So, I just left the commonalities out there. ”

"Then, use the method of elimination, use the point of view of this option to confirm the point of view of the next option!"

"If we directly set option A as a constant and correct condition, then through calculation, we will find that options B and D are correct, however, option C is very different from option A."

"Since the three options A, B, and D can be deliberately confirmed, and the question is a multiple-choice question, therefore, choose option C directly!"

Li Chenglong said as he carried out at least 20 steps of deduction on the scratch paper, and the time was nearly three minutes!

Three minutes, giving a multiple-choice question at the beginning of the question, is very unwise!

Fang Ding didn't speak, and continued to point to a dynamic problem in the tenth question and asked Li Chenglong about the solution.

This problem is indeed a bit difficult, and it uses a lot of mathematical knowledge, whether it is basic elementary functions, inequalities, multivariate equations, dynamic points, changing graphs, etc.

Without a solid foundation in high school math, there is no place to start solving problems.

However, when Li Chenglong came up, he directly listed several relationships between dynamic points and equations, and discussed them according to the situation.

In each case, Li Chenglong wrote in an orderly manner, and even deduced it very quickly, and the conditions corresponding to each situation, Li Chenglong also declined!

However, when Li Chenglong calculated the results, Fang Ding obviously saw that Li Chenglong added a three to five and directly calculated it into seven.

…… However, Fang Ding still didn't speak, and he guided him to let Li Chenglong think about the solution method at that time.

Fang Ding also sat next to him, his eyes were calm, and it was not until the entire test paper and all the questions were guided by Fang Ding for Li Chenglong to recall again that Fang Ding spoke.

In the whole process of solving the problem, Li Chenglong's eyes were extremely focused, without a trace of distraction, and he kept staring at his steps, extremely focused!

"Okay, let's go back to multiple-choice question 3 again!" As Fang Ding spoke, he used some True Yuan slightly, making his voice sound deafening.

"The third question, you took three minutes and sixteen seconds for this question!" Fang Ding said this sentence first.

"What?" Li Chenglong's eyebrows moved slightly, his forehead was slightly unkempt, three minutes was enough for an elective question, a very big question to answer.

This is just a multiple-choice question at the beginning, "How so?" Li Chenglong was secretly surprised in his heart.

Immediately afterwards, Fang Ding's voice was not loud, but it was very clear, and it was very clear that people could hear it very clearly.

"Your solution, directly use hypothetical inference, assume option A as the correct condition, deduce option B and option D, and if option A is true, deduce that option C is the correct answer."

"But! You ignore that the question is a condition of existence, and this is a mistake on your part! ”

"Moreover, you also made a mistake in thinking!"

Li Chenglong's brows furrowed, he tried his best to think, small beads of sweat rose on his forehead, and finally shook his head, "I can't think of a mistake in my thinking!" ”

Fang Ding suddenly raised his voice slightly, "It's an exam skill!" ”

"Knowledge should be treated with a rigorous and pragmatic attitude, but the exam has test-taking skills!"

"After so many years, following the rules, the teachers also used the conventional method to solve the problem, and the students almost forgot the most primitive and effective way!"

"In this problem, if you directly replace a, b, and c with three numbers, for example, 3, 2, 1, then you can find the correct option at a glance in a maximum of twenty seconds, and the problem will be solved!"

Before Fang Ding finished speaking, a look of struggle appeared in Li Chenglong's eyes. It seems to agree with the simplicity of this method, but there is a faint struggle that is difficult to break through the convention.

Fang Ding didn't say anything, pointed to the tenth question, and said, "Now, use this kind of thinking to do this question!" ”

Li Chenglong had just recovered from the struggle, and his eyes were spinning rapidly.

Suddenly!

"This, just bring in a zero point!" Li Chenglong said with some surprise.

For this problem, he spent more than five minutes just deducing, and in the end, the result was miscalculated. However, with a different way of thinking, in a few seconds, a moderately difficult problem was solved!

In Li Chenglong's eyes, there was suddenly a touch of color!