Chapter 135: 135：

It can be clearly felt that Dai Pingbo was teaching him by himself. When he talked about certain knowledge points, he would stop and ask Lin Xian if he understood it.

If Lin Xian shook his head, he would repeat it several times.

Letting a university professor be a tutor is too awesome. Anyway, Lin Xian felt very good.

After the 90-minute class, Dai Pingbo took a sip of tea and asked with a smile, "How do you feel?"

Lin Xian nodded and said, "It feels like opening the door to a new world. It's very interesting."

"Mathematical modeling is the same as basic mathematics. The best way to improve is to do more questions and not be afraid of mistakes. Only when you make a mistake, you can make progress."

Dai Pingbo smiled kindly: "I will assign you an assignment. Go back and do it slowly, and leave it to me in the next class of mathematical modeling."

With that said, Dai Pingbo took out a pen, took out a piece of white paper, and quickly wrote a question.

After receiving the question, Lin Xian suddenly felt a little confused when he saw it.

[Deep hole estimation: If you are standing at the entrance of the hole and you only have a calculator with stopwatch function on your body, out of curiosity, you can use the method of throwing a stone to hear the echo to estimate the depth of the hole, and the time is t=5. In the following situation, analyze the problem, give the corresponding mathematical model, and estimate the depth of the hole.

(1) Excluding air resistance;

(2) Subject to air resistance,...proportional coefficient=0.05;

(3) Subject to air resistance

Scale factor = 0.0025;

(4) In the above three cases, if you consider the time required for the echo to come back. 】

Seeing his expression, Dai Pingbo patted him on the shoulder and smiled: "Go back and think about it slowly. It doesn't matter if you can't do it."

Lin Xian nodded and said, "Okay, I'll go back and try it."

After Dai Pingbo left, Lin Xian suddenly discovered that none of the girls in the classroom had left. At this moment, everyone was looking at him with weird eyes.

Their thoughts are similar to those of Lei Hongguang, like Lin Xian, who is tall, rich and handsome, shouldn't they seduce girls, drag racing, and go shopping at nightclubs?

It doesn't help you to play golf or bowling.

Lin Xian's performance was too far from their imagination, and a strong sense of disobedience was involuntarily produced.

The style of painting is completely wrong!

Lin Xian ignored them and packed up his books and returned to the dormitory.

Now the day procedures have been completed, and you can go out at any time.

Putting the alien notebook into a shoulder bag, and bringing homework assigned by "Mathematical Analysis" and Dai Pingbo, Lin Xian drove the Ferrari out of the campus leisurely.

After returning home and opening the door to enter, Lin Xian couldn't help but take a moment to look at the whole house with a new look.

There are some art paintings hanging on the walls, and many small ornaments on the coffee table and counter. In addition, a hanging basket of rattan chairs stands on the originally empty balcony.

Zhuang Tong and Nie Qingqing were lying comfortably in the hanging basket, holding a laptop as if they were watching a web drama.

Seeing Lin Xian's return, Zhuang Tong sat up and smiled: "My dear, are you back?"

"Yes, the home furnishings are pretty good!" Lin Xian looked at the room and said with satisfaction.

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Zhuang Tong's vision and aesthetics are very good, and the decoration fits well with the house decoration style.

What satisfies him most is the wicker chair hanging basket on the balcony. In winter, lying on it, reading a book, and enjoying the afternoon sun in winter, it is not too comfortable.

"Do you like it?"

Zhuang Tong's expressive expression on me is very cute.

"Like it! Reward you tonight!"

"Ahem! Can you pay attention, there are outsiders!" Nie Lili said quietly.

The dog men and women became more and more unscrupulous, and they started in front of themselves.

Lin Xian put on slippers and said jokingly: "You can also join, I don't mind."

Nie Qingqing's appearance is not low, with 91 points and 87 points in body.

Although slightly worse than Zhuang Tong, it is also a proper goddess. I don't know how many licking dogs kneel and lick.

The two of them have their own good times. If she wants to, Lin Xian doesn't mind having another lover.

"Hehe, I don't mind, it's better this way, we can be good girlfriends for a lifetime." Zhuang Tong said with a grin.

In an instant, Nie Qingqing's heart moved.

But thinking that if she became a junior, her parents would probably kill her, so she immediately pressed down the crazy idea.

Chapter 4 The Heart of Champions!

After taking over Lin Xian's shoulder bag, Zhuang Tong, like a little wife, asked intimately, "I'll cut it for you if I want to eat any fruit."

"No, I'll do the problem for a while, you go and play!,"

Lin Xian was very satisfied with Zhuang Tong's attitude, and gently squeezed her pretty face.

"Huh!"

Zhuang Tong gave a soft cry, pecked on his face, then returned to the hanging basket, and watched a net drama with Nie Liqing snuggling together.

The two have similar personalities. If there is no one to accompany Zhuang Tong, Zhuang Tong can watch a day's web drama or do something else at home, so there is no need to worry about her being bored.

This is also one of the reasons why Lin Xian would agree to be her lover.

Many of the small three who have been nurtured will become empty and lonely in their hearts when they have a worry-free life with money and lose their goals.

In addition, he is a junior, and the other party cannot be with him every day, so many juniors will go outside to find excitement and mess around with the gold master.

But Zhuang Tong is different, her character is destined to not feel empty and lonely.

Just like Lin Xian, there are so many interesting things in the world, and his life is too short.

Taking out the pen and paper, Lin Xian settled down and began to think about how to solve this problem.

At first glance, this question will make people feel completely incapable of starting.

This is the typical performance of mathematical modeling.

It is necessary to use strong logic skills to propose a model hypothesis, and then use mathematical language and writing to fill this hypothesis little by little.

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