Dingling.

The bell rang for the end of get out of class, and Li Ziqian got up from the seat after completing the last step.

If you are not active in eating, you have problems with your thoughts.

In just about a minute, most of the students in the classroom had dispersed.

“How to say it?”

Li Ziqian stood up and stretched, looked at Mo Nanbei, who was also packing the papers stacked on the table, and asked to her.

"Go to the supermarket to buy stuttering, and then come back."

“OK.”

Unfortunately, he thought so too.

When I have lost the opportunity, I will now queue up in the cafeteria, so I will start at least thirty minutes after I come back after dinner.

A little waste of time.

Anyway, he is not very hungry now. He goes to the supermarket to buy some bread and then goes to the side to order a cup of milk tea. Isn’t this much more comfortable than going to the canteen to crowd people?

As for how to buy milk tea from school?

This depends on your relationship with the security room man and his "acting skills".

Fifteen minutes later, Li Ziqian returned to the classroom, and not long after, Mo Nanbei also came back.

She was holding a white plastic bag from the school supermarket in one hand and a cup of milk tea in the other hand.

Walking back to the seat, Mo Nanbei threw the things in her hand onto the table, then took out the paper she had written in the previous self-study class from the hole, and said to Li Ziqian.

"I saw that you were writing in the self-study class, so I wrote your part in the third volume."

"Ah..."

Too many elements.

This is the only thought in Mo Nanbei since he entered the door.

Not to mention the same dinner configuration, he doesn't know how to say it just because he wrote Volume 3.

Mo Nanbei looked at the paper and subtle expression taken out of Li Ziqian's hands, and she probably understood what was going on.

With a slight tactical backwards, Mo Nanbei blinked in confusion and asked Li Ziqian,

"Then... since that's the case, let's get the answer?"

"It's OK."

"Then let's get the answer right first."

"good."

As he said that, Li Ziqian picked up the third chapter and read out the answer to his multiple-choice questions.

“Multiple choice question, ACDAC”

"ACDDC", Mo Nanbei frowned slightly and said her answer with a little confusion.

“Question 4?”

Li Ziqian asked about the inconsistent answers to the two people on this question, so he continued,

"It's obvious that I chose A."

"Cha? Isn't this obviously choosing D?"

Faced with Li Ziqian's tone of "Your designated a problem", Mo Nanbei gave the same response.

"No, this question is very obvious. Read the question and take a good look at what you are writing!"

"Just be able to do this question, how could anyone have miscalculated? It's obvious that it's D. What are you thinking?"

"I've written the steps, this question."

"It's a coincidence that I wrote it too."

"As long, let's show it to me."

"I think so too. This question is not true. What should I learn? Find an electronics factory to work?"

The two of them, who were looking for the steps to do the test with straw paper, did not stop for a moment.

“I found it.

What if you calculate this wrongly, right?" Li Ziqian asked Mo Nanbei, slapped the paper with the steps in his hand on the table.

"I'm so laughing, can I get this wrong?"

"bet?"

"What are you betting on?"

While asking the question, Mo Nanbei leaned back and leaned on the back of the chair, raised his right leg and raised his left leg, raised his eyebrows, and asked Li Ziqian with a slightly raised chin.

Obviously, she is also interested in the 'bet'.

What to bet on...

Scandaling the things on the table, Li Ziqian blurted out,

"Ten cups of milk tea."

"Clam?"

"What, you're scared?"

"Test your mother!"

"Okay! Then bet!"

"Then bet!"

When the situation developed like this, Li Ziqian felt it was a bit incredible and reasonable.

I always feel that it would be very common if I did this with my own hxd, but now the person who is exaggerating is actually a female deskmate who only communicates for a day...

A subtle mood?

Li Ziqian did not continue to consider the detailed and complicated things. Now his focus is on the fourth multiple-choice question in the third chapter.

The title is this:

The pyramid is one of the architectural wonders of the ancient world. Its shape can be regarded as a regular quadrilateral pyramid. The area of ​​a square with the height of the quadrilateral length is equal to the area of ​​a side triangle of the quadrilateral. What is the ratio of the side length of the bottom side of the triangle above the ground square on its side?

The four options, AC is, the root number of quarter five plus or subtract one; BD is, the root number of two five plus or subtract one.

The result obtained by Li Ziqian after calculation is A, that is, the root number five is reduced by one to four.

Mo Nanbei felt that this question should be chosen D, which is the root number of five plus one.

"How did you calculate this question?"

Li Ziqian, who felt that he would definitely not have any problems, asked Mo Nanbei first.

"It's very simple. Suppose the bottom edge of the side triangle is a and the height is h."

Mo Nanbei placed the thumbnail picture drawn on the grass paper in front of Li Ziqian. While circled his steps, he continued to say to Li Ziqian.

"In this way, the height of the side triangle, the half of the side length of the bottom square and the height of the regular quadrilateral pyramid form a triangle.

In this way, you get the high expression of the positive quadrilateral pyramid, and then just solve it."

‘High expressions are the same…’

Listening to Mo Nanbei's story, Li Ziqian turned his head and looked at the steps on his grass calculation paper.

The solution to his problem is not much the same as that of Mo Nanbei.

He first introduced the expression of two isosceles lengths of the side triangle, and then the expression of the height of the positive quadrilateral pyramid based on the length of the square side of the base and diagonal lines.

But...high expressions are the same, so in the end it is the problem of solution?

Theoretically, this step has been introduced. There is no reason to not solve the following questions, right? Is there no reason to answer differently?

If you analyze it for a while, then the reason why the two of them have different answers is the calculation problem?

Thinking of this, he picked up Mo Nanbei's grass calculation paper, looked at the steps carefully, and began to calculate on the white paper beside his hand.

The equation is 4x2-2x-1=0. After solving it, x=1± root number five, which is 4...

4!!

Mo Nanbei’s denominator is written in 2!

"Hey, tell me!"

???

Again…at the same time?

"You've calculated the wrong number."

"ha??"

The two voices were heard in unison twice in succession.

When Li Ziqian discovered Mo Nanbei's mistake, the other party seemed to have discovered his problem.

"No, I found that you calculated the wrong number." Li Ziqian said.

"Well, I also found that you calculated the wrong number." Mo Nanbei said to Li Ziqian after being stunned for a moment.

“…”

Li Ziqian looked down at the answer he got from the paper.

Root number five plus one to four.
Chapter completed!