Although Blue Ice was able to breathe freely on land, she had to return to the water from time to time, or her skin would crack from being too dry.

And her respiratory system isn't particularly perfect right now.

It's just that this process is a bit frequent and cumbersome.

Yi Cheng thought about it, then found two pieces of cloth and made a small curtain with scissors and a needle.

And a small window was cut on it.

He placed a small basin of water at the right end of the table for Lan Bing to nourish herself, and then built a small Rubik's Cube next to it to provide her with the steps to go up.

If Lan Bing wants to move freely, then she can come out of the basin and open the curtain to interact with him.

If you want to soak in the water, you can lie on the edge of the basin and see the outside world through the small window.

The only trouble is that the splash will fall on the table as she goes in and out.

So Yi Cheng spread another layer of towels on the table.

Looking at his serious and meticulous appearance, Lan Bing was slightly stunned.

This boy didn't seem to be as annoying as she thought.

"How did you do so much? Needlework again, and such meticulous housework? Lan Bing sat on the table, his back against the toy couch he had brought.

This delicate soft leather toy sofa was given to her by someone else when her aunt accepted an invitation to cooperate with an animation company.

Although the anime cooperation was not negotiated later, it did not prevent her from accepting this gift with peace of mind.

Speaking of which, this aunt of his, likes two-dimensional things even more than him.

Crystal cups, magic wands...... A wide variety of figurines, as well as a collection of comics.

Game......

It's just a pity that those things are too much of a waste of time.

Nothing is more important than learning.

Yi Cheng shook his head and explained, "I live with my aunt, and she's a nervous woman. So I do all the housework. ”

Yes, the woman even threw his clothes to him to wash.

During the time she was out and about, he had to worry about whether the idiot aunt had lost her way in some country, or had been tricked into going where she couldn't write at the beginning.

"Oh, yes."

Yi Cheng handed her a paper clip.

"If you don't think your clothes fit, use this first. I'll go buy you two more tomorrow. ”

He was halfway through his sentence when two long eyebrows came together.

"But I'm not very good at picking out girls' clothes."

Let's see if Xiaobai can help.

"It doesn't matter." Lan Bing grabbed the paperclip about the size of her palm in her loose collar and looked up and smiled at him.

I wonder if there will be tomorrow.

It's just a dream.

It's not a serial, how can you see it every day.

Strange to say, when he was done with all this, sat back in his chair, and looked at the system-

He was surprised to find that the goddess's favorability for him had risen to 60.

This is such an exaggeration, and it was not wanted to fall before.

It's 60 now?

This is far more than Yicheng expected.

Are girls all beauty-loving creatures?

It's boring and innocent.

Yi Cheng pursed his lips and took out the math simulation paper from the drawer and spread it on the table.

Finally there is time to study.

Looking at the time, it was already half past eleven after all this, and he couldn't help but feel extremely sorry for his wasted youth.

He stood up and glanced at the goddess sitting on the table.

60 points of favorability, it won't be lost in one night, right?

"It's late, shall we go to bed?" He learned from his previous lessons, this time in a caring tone.

"Huh?" Lan Bing raised his sluggish face, and he didn't know why it became crimson and hot again, "Hmm...... Okay, okay. ”

Yi Cheng surrounded her with the curtain, turned off the light, and lay down on the bed.

……

Ten minutes later.

【In Dream】

Yi Cheng returned to his desk, turned on a lamp, and began to work on today's math test.

It's been a long time since I've done a math test, and I've dedicated my time to biology, Chinese, and English.

This time, it's going to be refreshing!

He moved his muscles and began to answer questions frantically.

Of the 150 minutes he booked, he completed it all in 100 minutes.

The college entrance examination mock paper is too simple this year, right?

He spent another half an hour checking it and began to check the answers.

Well, right.

Right.

Right.

……

All the answers were correct, and in order to keep himself modest, he deducted two points for his untidy handwriting in the later big questions.

148 points.

Satisfy.

After doing this, he turned out the private goods that Teacher Ran gave him today from his schoolbag.

The above is a proof question:

Prove that the equation [x](x^2+1)=x^3 has and only one real root in the interval of any continuous positive integer.

(Note: [x] indicates the largest integer not exceeding x)

This problem seems very simple, because the scope of knowledge involved is no more than that of junior high school, and the simple unary function, the 3rd power operation, has been learned in junior high school, and it does not look like a high school problem at all.

But since Mr. Ran put it here and gave it to him as a private item, he obviously had his own special reasons.

Yi Cheng certainly wouldn't be foolish enough to think that this was really a simple question.

In fact, he has realized the mystery contained in this thing-

This is a Gaussian function problem.

The Gaussian function is not within the scope of the quasi-textbook, and is only briefly explained in the after-class exercises of the first year of high school.

Speaking of which, this function has a wide range of applications and is most often used as a geographical survey.

The Gaussian function is illustrated in this question.

[x] is the integer part of x, and y=[x] is a function defined on a set of real numbers, also known as a Gaussian function.

Yi Cheng has been with Teacher Ran for so long, and this little knowledge is still there.

So he took up his pen and wrote:

Suppose n=[x], m={x}, and m is the decimal part of x.

Then x=n+m, substituting the formula can get:

n(（n+m）^2+1)=(n+m)^3

……

After that, I unfold the formula.

……

After half an hour, Yi Cheng stopped writing.

He was aware of the danger.

Beneath the cloak of the Gaussian function, lurks a beast of prey.

The beast looked at him as if in the darkness waiting for him to fall into a trap, with two glittering green eyes.

"Ah!!h

Yi Cheng broke out in a cold sweat and sat up from the bed.