The next day, in order to thank Chen Yushan for introducing him to this part-time job, Lu Zhou decided to treat her to a meal.
However, on the question of whether to eat the braised chicken or the KFC, he fell into a dilemma again.
Therefore, he asked the other living person in the dorm – Liu Rui.
Liu Rui, who was playing online games with his friends, was sent back to the fountain. He was annoyed and did not listen to Lu Zhou's question. He replied without turning his head, "Hot and spicy, cheap and affordable!"
Then …
Lu Zhou treated him to a meal.
Chen Yushan, who had a ponytail, was sitting across from Lu Zhou at the entrance of Shancheng Mala Tang. She was so spicy that she stuck out her tongue.
Although tears were coming out of her eyes, Chen Yushan forced herself to eat and asked, "How is it? Can my sister's mathematics be saved? "
Is it that spicy?
Lu Zhou was confused as he threw a fish ball into his mouth. He said while chewing, "Can be saved … Maybe? I'll try my best. "
"Then I'll leave it to you. My sister, she … Actually, her science grades were very good in junior high, but then … Ahhh, it's so spicy."
Lu Zhou handed her a glass of water and asked, "Then?"
After drinking the water in one gulp, Chen Yushan stuck out her tongue cutely and took a deep breath before continuing, "Then … my aunt and uncle's relationship had a bit of a problem. The two of them were fighting for custody of Meng Qi. I don't know the specifics, but Meng Qi is temporarily living with my aunt. "
Lu Zhou nodded silently and did not say anything.
He did not care about other people's private affairs. In a sense, he was a very selfish person.
After finishing the spicy hot pot, Lu Zhou dropped Chen Yushan back to her dorm building. He then turned around and went to the library.
On the way to the library, he received two emails.
One of them was from Teacher Liu. It was about the feedback from the data modeling assignment.
The other email was a reply from the [Modern Communication and Geographic Information Technology] journal. It said that the payment had been transferred to his bank account. 150 yuan per article, a total of 1350 yuan.
"…"
Nine SCI theses were only worth so little money. Sure enough, building a missile was not as good as building a fried egg …
Lu Zhou could not help but sigh in his heart.
However, more than a thousand yuan was not a small amount. Including the three thousand yuan he earned from tutoring yesterday, he now had more than seven thousand yuan in his card. It was definitely enough to pay for the tuition.
Originally, he planned to drag it on and make up for it all at once before graduation, but now it seemed that there was no need.
In the next few days, Lu Zhou's life was very regular. He stayed up late on Mondays, Wednesdays and Fridays to study. Tuesdays and Thursdays were used to consolidate his studies. At the same time, he prepared for other subjects such as information technology, electrical engineering, biology, chemistry, and so on. Other than that, he did not neglect his mathematical modeling practice.
Sometimes, he really felt that if he could maintain this good study habit, even without the help of the system, it was only a matter of time before he became a top student.
However, with the help of the system, this process was accelerated.
It was as if a rocket had been inserted into it …
On Saturday, as usual, Lu Zhou went to Mrs. Yang's house to tutor Han Mengqi in mathematics.
Maybe it was because of the accident last time, or maybe it was some kind of agreement between the mother and daughter. This time, before Mrs. Yang went to work, she did not lock the door. She only told Lu Zhou to take care of her daughter.
Han Mengqi watched her mother walk out the door without any expression. Then, she looked at Lu Zhou and said, "Then, let's start."
After that, she turned around and went back to her room.
Han Mengqi's footsteps entered the room. Lu Zhou was surprised to see that after not seeing her for a week, she actually tidied up the room.
Without any unnecessary conversation, Han Mengqi opened the book on the table and flipped to the corner page. Then, she looked at Lu Zhou.
"According to the outline you gave me, I've already seen the second compulsory analytic geometry … Then?"
"Then?" asked Lu Zhou as he raised his eyebrows. He smiled and asked, "Tell me what you don't understand first."
"There's nothing I don't understand. It feels pretty simple," said Han Mengqi impatiently as she raised her head. "Then?"
"Then let me test you," said Lu Zhou as he took a piece of A4 paper and wrote on it.
[In the Cartesian coordinate system, the left and right focal points of the ellipse are F1 and F2 respectively. F2 is also the focal point of the parabola C2: Y2 = 4x. Point M is the focal point of C1 and C2 in the first quadrant, and | MF2 | = 5/3. Find the equation of C2.]
After writing this question, Lu Zhou made a "please" gesture.
Han Mengqi's eyebrows twitched. She did not expect Lu Zhou to test her on the spot.
She clenched her teeth and picked up a pen. Then, she looked at the draft paper and thought for a long time.
In the end, after ten minutes, she only solved the first step.
Which was —
[From C2: Y2 = 4x, F2 (1,0).]
After waiting for around ten minutes, Lu Zhou looked at his watch and smiled. He said, "During the college entrance examination, you were only allowed to think about a question for ten minutes. Now, it looks like you can only get three points for this question. "
"Oh …" Han Mengqi clenched her teeth as she looked unconvinced. However, this was the nature of problem solving. Sometimes, the more anxious you were, the more difficult it was to solve.
Lu Zhou smiled and pulled out a paper from the pile of papers. He pointed at the second last question and said, "And the most important thing is that you missed this question on this paper."
"… You're bullying me," said Han Mengqi as she threw the pen away. She stared at Lu Zhou and said, "I know I'm stupid, okay?"
"I'm just teaching you. I never said you're stupid. On the contrary, I think you're smart, so please don't belittle yourself." Lu Zhou picked up the pen and wrote down the rest of the process on the A4 paper. He said, "The key to this kind of question is to determine the value of M, so the second step must be M (x1, y1). Then, according to | MF2 | = 5/3, and M2 on the parabola C2, we have to solve these two conditions …
"Our second goal is to find the semi-focal length of the ellipse C1. Solve this step, and the rest of the problem becomes a problem of solving the equation system."
Lu Zhou wrote down the key points of each step on a piece of paper and sorted out the ideas for solving the problem.
At first, Han Mengqi was impatient. However, her eyes gradually became serious as she stared at the paper.
Finally, there was a hint of understanding on her face.
Han Mengqi, who was staring intently at the draft paper, frowned and nodded thoughtfully, "So that's how it is …"
"Your teacher must have talked about it, but you've never heard of it."
"Our teacher … didn't explain it as detailed as you," said Han Mengqi.
Lu Zhou was amused. He said, "Why don't you tell your math teacher? Let's see if you can piss him off."
Han Mengqi gritted her teeth, but there was nothing she could do. She could only snort.
"No wonder my sister said you're mean …"
Lu Zhou:???
Someone's talking behind my back?
I can't pretend I didn't hear this.
Lu Zhou coughed and changed the topic. He picked up the pen and said, "This question is a typical elliptic equation problem. I believe next time you encounter this type of question, you'll get at least half of the points."
Han Mengqi tilted her head and asked, "What about the other half?"
"The other half is on the second question. This type of question is usually combined with vector questions, so there's usually a second question …"
Lu Zhou continued to write on the question stem.
[Point N on the plane satisfies vector MN = vector MF1 + vector MF2, line l = MN, and C1 intersects points A and B. If vector OA * OB = 0, find the equation of line L.]
When Han Mengqi saw the question, she was completely dumbfounded. She looked at Lu Zhou helplessly.
However, Lu Zhou did not look at her. Instead, he sat on the edge of the bed and picked up the exercise book. He began to look for the next example.
"Try it first. If you can't solve it, I'll teach you. You have fifteen minutes, start."
It was even worse than the first question. This time, Han Mengqi only wrote the word "solve". She did not get anything else right.
Lu Zhou did not know if it was because he had a sister, but he did not feel very impatient. He did not mock her for giving him a "free point question". Instead, he patiently explained the process of solving the problem to her.
Han Mengqi looked at the steps on the draft paper and her eyes widened. She whispered, "That's amazing …"
"My learning process is to constantly summarize and learn from my mistakes. I hope you can find the questions that you don't understand. It's best if you can write them down in your notebook. I'll explain them to you every week," said Lu Zhou as he handed the notebook back to Han Mengqi. He then said, "Memorizing the mistakes is necessary for studying mathematics. If you want to be good at science, you have to be prepared. It's like when an ADC carries Dolan, and when a support carries a pair of eyes. It's all basic. "
Han Mengqi's eyes lit up. She immediately became interested and interrupted, "You also play League of Legends? Which region? My healer is awesome! "
"… BlackBerry."
"I'll add you! Give me your QQ number … Ouch! "
Select text and click 'Report' to let us know about any bad translation.
