"This?" Lin Xiaorou rubbed her eyes to confirm that she was not dazzled, and she wondered: "This is called a natural constant, and it is an infinite and non-circular number." ”

"Infinite non-circular numbers, what is that?" Lu Fei continued.

"This ......" Lin Xiaorou was embarrassed, and said in her heart Who knows this thing, it seems that the teacher said it in high school, she frowned, searched for the knowledge in her memory, and finally replied: "It's probably 2." It doesn't matter how many times 7 is, you just know it's a constant. ”

"yes, I see. Lu Fei looked at the notes happily, because knowing such a concept, he found that he could already understand several sentences.

After solving the first problem for Lu Fei, Lin Xiaorou was also slightly relieved, if Lu Fei asked such a simple question, then it would be too easy to tutor him in mathematics, but his mathematical foundation was so poor? Why didn't he even know the constants of nature? This is high school knowledge, right?

Without allowing Lin Xiaorou to think too much, Lu Fei's second question came again, he pointed to the symbol "sin" and asked, "Xiaorou, what does this symbol mean?"

"This?" Lin Xiaorou looked at Lu Fei's eyes, confirming that he was really not joking, and her heart was even more puzzled.

"Well, and this and this, they often appear together, what do they mean?" Lu Fei asked.

Lin Xiaorou looked at the symbols pointed by Lu Fei, one was "cos" and the other was "tan", and couldn't help but cover her mouth and chuckle. She is now completely relieved, these things Lu Fei asked are middle school knowledge, although she is so-so in high mathematics, but her math score in the college entrance examination is still good. Lu Fei's middle school mathematics is so bad, how far does he deviate from the subject? Thinking of this, Lin Xiaorou asked, "Lu Fei, do you remember trigonometric functions?"

"Trigonometry? Lu Fei shook his head.

Lin Xiaorou was overjoyed when she heard this. Thinking of this, she said seriously: "Lu Fei, trigonometric functions are a very important part, let me give you a good explanation." ”

"Okay, thank you. "Lu Fei finally found out what was wrong, I could understand a few sentences just now if I knew a natural constant, and now if I understand trigonometric functions, then I will definitely be able to understand even more......! What kind of number is a function?

Lin Xiaorou was concentrating on answering Lu Fei's questions on the side, and after Zhou Ruolan practiced a few dances, she planned to take a break. She looked at Lin Xiaorou and Lu Fei, and couldn't help but wonder in her heart, is Xiaorou's high number 86 instead of 68? Why does she look very good? Looking at Lu Fei's expression, it is very much in recognition of what Lin Xiaorou said, what is going on...... Xiaorou shouldn't have retaken the high math course in order to give a lecture to Lu Fei? She was too attentive, right? Thinking of this, Zhou Ruolan couldn't resist her curiosity, so she gently came to the row of seats between the two of them, and pretended to sit down and rest.

After listening to the content of the lecture, Zhou Ruolan looked at the two of them in surprise, are they playing a game between the teacher and the student? Aren't they tutoring high math? How do you talk about trigonometric functions? Seeing the two of them focused, Zhou Ruolan could only temporarily put the question in her heart, and was ready to interrogate Lin Xiaorou later. This is not a make-up lesson, this is clearly a romantic game......

When Lu Fei was making up for class, in the villa of Fengya Villa, Cheng Yiqiu was persuading a beautiful woman: "Sister Dongfang, you still don't want to go back, right? Is your home still like a home? It's better to be here with me." ”

This beautiful woman is Dongfang Muxue, she looked at Cheng Yiqiu with a sad face, and said with a smile: "Yiqiu, his parents are here today, he must make something to show the old man, I will come back tomorrow." ”

"What's there to do? If you want me to say, you can just go to the showdown. Your husband treats you like that, what else do you insist on?" Cheng Yiqiu frowned.

Dongfang Muxue shook her head: "Yiqiu, you don't understand, I'...... Alas...... It's not all his fault. ”

"Sister Dongfang, why don't you blame him? If he hadn't drunk and driven, he wouldn't have had a car accident, and if he hadn't had a car accident, you wouldn't have fallen into that problem!" Cheng Yiqiu said unconvinced.

Dongfang Muxue shrugged her shoulders and said slowly: "It's all fate...... I've been in therapy and I don't think he'll be the same as long as he has a baby. ”

"I'm worried that before you have a child, you will be damaged by him first! When did you come home with scars?" asked Cheng Yiqiu.

Dongfang Muxue's face was gloomy for a while, and she forced a smile and said: "With his parents here today, he won't beat me again, don't worry." ”

"Oh......" Cheng Yiqiu pouted, "I was left alone that night, I was afraid ......"

"Alone?" Dongfang Muxue smiled slightly, "You can call your boyfriend again, just like last time." ”

"What is the same as last time?" Cheng Yiqiu blushed, "What boyfriend?"

"Huh. Dongfang Mu Xue covered her mouth and smiled, "Yiqiu...... You...... The last time I came back, there were cigarette butts in the house, so don't tell me you smoked them. ”

"I ...... Sister Dongfang, how are you like a spy? Cheng Yiqiu sighed dejectedly, "I don't dare to call him...... This lonely man and widow, I am very traditional. ”

"Oh?" Dongfang Mu Xue showed a surprised look and said suspiciously: "You didn't have a ...... that night Didn't sleep together?"

Cheng Yiqiu had a sweet look on his face when he heard this, shook his head and said, "No, he sat on the sofa, and I slept on his lap all night." ”

Dongfang Muxue looked at her in disbelief, and only after more than ten seconds did she speak: "Oh my God...... Yiqiu, you are really ...... I'm so happy, I really envy you......"

"What do you envy me?" Cheng Yiqiu's face turned red again.

"I'm still worried about the character of your rich second-generation boyfriend, I didn't expect him to ......" Dongfang Mu Xue paused and continued: "Yiqiu, your boyfriend is good. ”

"What's not bad...... Cheng Yiqiu muttered, and said in his heart that the dead bastard was dragging it like 2580,000 all day long, and I confessed it first! It's a shame! This must not be known to Sister Dongfang!

"It's just good, such a good opportunity to sit still. Dongfang Muxue smiled, "You said that if he did something that night, did you refuse?"

"Hmph! he dare!" Cheng Yiqiu bit his teeth lightly, looking righteous and awe-inspiring, but in fact, he didn't have any bottom in his heart. Thinking of the intimate behavior of the two in the slow shake bar, Cheng Yiqiu's eyes began to wander.

Dongfang Muxue smiled softly, too lazy to poke her, but said thoughtfully: "Yiqiu, there are not many good men, hold on." ”

"Hmm......" Cheng Yiqiu sighed dejectedly, "Sister Dongfang, I'm under so much pressure, I'm afraid I won't be worthy of him." ”

"Is it worthy?" Dongfang Mu Xue said in surprise, "You have to have a degree of education, you have to have good looks, you have to have a figure, and the future star journey is limitless, he is just a rich second generation, he is not worthy of you, right?"

"Sister Dongfang...... No. Cheng Yiqiu shook his head, "Do you know the Duan Group?"

"Duan's Group?" Dongfang Muxue nodded and said in surprise: "Oh my God, your boyfriend won't be the young master of the Duan Group, right?" ”

"Sister Dongfang......" Cheng Yiqiu smiled helplessly, and said slowly: "The young master of the Duan Group is his friend, and his attitude towards him ...... Well...... How so...... Very respectful. ”

"What?" Dongfang Mu Xue said in surprise, "You're not kidding, are you? a person who makes the young master of the Duan Clan very respectful? He, what is his origin?"

"Sister Dongfang, I didn't ask, I'm scared ......" Cheng Yiqiu said in a low voice.

Dongfang Muxue sat next to Cheng Yiqiu, put her arm around her shoulders and said, "Yiqiu, what kind of people do you know?" The person who can make the young master of the Duan Group respect, if it is a person from the political circle, then it is at least a city-level cadre in LH City, if it is a person from the business world, I only know the Qiao Group......"

Cheng Yiqiu sighed and said: "It shouldn't be Qiao's Group, he is very familiar with South America, and his family should be engaged in cross-border trade." ”

"South America?" Dongfang Mu Xue opened her mouth, remembering that South America is one of the drug centers in the world, he can't be a drug lord, right? But this kind of light and heavy words, Dongfang Mu Xue will not say, she just shook her head, "I can't think of it, I think you should ask, I go home today, it is just an opportunity." ”

"Hmm......" Cheng Yiqiu nodded thoughtfully, a little looking forward to seeing Lu Fei, but also a little scared......