beluga island

In the suffocating silence, the professor coughed and said, "Continue the discussion."

Only then did the others withdraw their gazes, and the sound of chaotic discussions reappeared in the classroom.

Xia Qijing scratched his hair, and said to the other three: "You discuss your own, don't worry about me."

The alpha frowned: "How can that be done? Group discussion, the most important thing is to participate together. Everyone must participate in the collision of ideas!"

Xia Qijing: "?"

Alpha: "Thinking collisions actively burst out sparks of wisdom, and conflicts and conflicts can build a good style of study together. When encountering difficulties, shrink back, and the difficulties will only increase."

Xia Qijing: "...Has anyone ever told you that you have the potential to be a leader?"

"How do you know, I plan to run for the chairman of the student union next school year," the alpha said kindly, "Every student is a part of the group, so I will not let go of any opportunity to help students. As long as the mind does not slip , There are always more ways than difficulties! Don’t be afraid to fall behind temporarily, and fight steadily without pulling your hips!”

The candidate chairman began to enthusiastically explain the problem-solving ideas to him.

"This question is actually very simple. It is the Laplace expansion. Let B=?(bij) be an n×n matrix. The remainder formula Mij of B about the i-th row and j-th column means that B removes the i-th row and the first The n?1 order sub-matrix obtained after j columns..."

After the candidate chairman finished speaking intoxicatedly, he asked the other two people: "You also understand it in the same way?"

The two men nodded.

The candidate chairman turned his head again, and asked Xia Qijing kindly: "I should understand now, right?"

Xia Qijing: "..."

How to do.

What should he say.

If he were to tell the truth, he would be suspected of having an IQ problem.

What if they pretended to understand and they asked him to repeat it.

Under the eager gaze of the candidate chairman, Xia Qijing coughed and said in a low voice, "That..."

"Change location?"

Peng Qi turned around suddenly and said to Xia Qijing.

Xia Qijing: "?"

The candidate chairman was dissatisfied: "He belongs to our group, and each group has agreed to discuss separately. Don't break the rules casually."

"Don't be so rigid," Peng Qi said with a smile, "Anyway, the groups will have to exchange solutions with each other later, and the group that discusses quickly can communicate first. Shouldn't we race against time in class?"

Alternate chairman: "But the teacher didn't agree."

"Who said that?" Peng Qi immediately ran to the professor and said something in a few words. The professor nodded, and Peng Qi came back soon with a smile, "The professor agreed."

Now the alternate chairman has nothing to say.

Xia Qijing just wanted to escape this embarrassing situation as soon as possible, and almost immediately stood up with her schoolbag in her arms.

Compared with the enthusiasm in the group just now, Shiyu's group is much quieter.

Except for Shi Yu, the other two Xia Qijing are quite familiar. They seem to be friends of Shi Yu. The 1.8-meter handsome Alpha is a man of the academy and often plays basketball together.

When Xia Qijing sat down, none of them spoke.

Xia Qijing put away her schoolbag, thought for a while, and whispered to Shiyu, "Thank you."

Shi Yu didn't say anything, just took his pen and draft paper.

The green-haired alpha sitting in front of Xia Qijing saw this, whistled, and smiled at Shi Yu: "Oh~ hero save the beauty~"

Shi Yu lowered his eyes and said nothing.

The sunlight outside the window spilled in through the transparent glass, and the black forehead hair left a faint shadow on his face.

Shi Yu's nose bridge was straight, and his eyelashes were thick and slender.

When the eyes are lowered, it is almost like a sleeping stone statue.

Another black-haired alpha saw that Shiyu was silent, hit his companion, and said with a smile: "What do you know, this is called helping the road when you see injustice."

The green-haired alpha groaned and said, "When I didn't know how to write questions before, I never saw Shishen so enthusiastic."

The black-haired alpha teased: "I don't even look at who the target is."

Lumao lamented: "I'm so pitiful, no one can help me... Father doesn't love me, mother doesn't love me, I'm a cutie who no one loves..."

Shi Yu raised his eyes slightly, and said flatly, "Why don't you usually talk so much?"

The green hair and the black hair smiled at each other and shut up at the same time.

Xia Qijing was a little embarrassed.

Fortunately, Shi Yu didn't say anything more, but picked up a pen, started to write on the draft paper, and said slowly: "This theorem means, based on the sub-form and the co-sub-form, if B is related to a certain The product of each sub-form of row k and the corresponding algebraic co-sub-form is added, then the determinant of B is still obtained..."

Xia Qijing listened attentively.

Shi Yu's voice has a magical power, it's not like a teenager or an adult man, but it's faint from beginning to end, with a transparent and refreshing texture like crunchy rock candy.

The speed of speech is unhurried, it seems that he is not eager to draw out the formula, but just narrates one thing in a normal way.

After the narration is over, everything is naturally clear.

Even in a noisy environment, it can clearly pass through thousands of barriers and reach your ears.

……

"So, try now and recalculate the calculation process just now."

Xia Qijing nodded, bit the tip of the pen, and slowly wrote on the draft paper.

Many people think that smart students must be good at teaching, but this is not the case. Smart students can hardly make detours because they can understand everything, so they can't understand why other people can't figure out such a simple topic.

In the teaching post, it is generally the teachers who did not have good grades when they were students who are more good at teaching. Because they have gone through detours, they understand why children with poor grades get into trouble.

What surprised Xia Qijing was that although Shi Yu had good grades, he was also very good at teaching.

As long as he speaks a little bit, Shi Yu can immediately understand his confusion, and then breaks up the formulas, and spreads them out one by one to demonstrate to him, telling him why x can go into curly brackets, and why y cannot be eliminated .

When the time was up, Xia Qijing calculated the result.

Xia Qijing didn't expect that he could actually calculate it, so he was very excited.

He grabbed Shi Yu's hand and said in a loud voice: "You are too good! This is the first time I understand linear algebra after college!"

Shi Yu glanced at his grasped hand, and smiled slightly: "Don't let the professor hear that."

Xia Qijing quickly shut up.

Lumao looked amazed: "Shishen, those who don't know think you are taking care of children."

The black hair interjected: "It's not like that with children, it's just chewing things up and feeding them into your mouth."

Lumao said disgustedly: "What a broken metaphor, it's disgusting."

Black hair: "You know what a fart, you single dog..."

Xia Qijing had no choice but to pretend that he didn't hear anything.

Linear algebra is indeed not easy to understand. In fact, besides Xia Qijing, there are still many people who have not understood the course.

Therefore, the professor took a lot of work and deduced the formula again.