~： 4 ways to write math and fennel beans

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A little sister was hung on a hanger, her hands and feet drooping naturally, twisting her waist from time to time, swaying.

"Swing on a swing, swing on a swing..."

Xiaoxiao murmured in a milky voice, and she played with herself. Seeing how happy she was, how could she feel the slightest grievance of being punished.

Sitting in Xu Ang's arms, Xiao Qingzi cast worried glances from time to time, she was worried about her sister Xiaoxiao.

"Come on, left hand."

Xu Ang motioned the little sister to change her hand, and Xiao Qingzi obediently stretched out her left hand so that her brother could cut her little nails.

"When your nails are long, you need to cut them. If you can't cut them, you have to tell your brother that you will cut them for you. Look at you, you will scratch the skin."

Blowing the conspicuous red mark on Xiao Qingzi's pinkish little arm, Xu Ang was educating this little guy.

Children's skin is very delicate, and they are easily injured when rubbed and touched, but they will scratch unconsciously, and adults will easily hurt themselves if they don't take care of them.

If Xu Ang hadn't noticed the scratches on her arm when he was holding Xiao Qingzi, he wouldn't have noticed it.

"Well, Xiao Qingzi will tell brother in the future."

Nodding her head obediently, Xiao Qingzi tried to plead for Xiaoxiao.

"Brother, you just let sister Xiaoxiao go."

Neither said good nor bad, Xu Ang first trimmed Xiao Qingzi's nails, and then carried her to the hanger.

Then, he hung Xiao Qingzi up too.

Xiaoxiao: "???"

Xiao Qingzi: "???"

The question marks on one end of the two little sisters didn't understand what was going on. Especially Xiao Qingzi, she didn't do anything bad, how could she be punished by her brother.

After a few sips on the faces of the two little sisters, Xu Ang said to them: "Xiaoxiao scolded her brother before, and her brother asked her to reflect for half an hour. Xiao Qingzi, you have to plead for Xiaoxiao, and my brother decided to give the punishment time. It will be shortened by half, but you will be punished with Xiaoxiao."

Isn't it asking for love, isn't it a sister's love, so let's hang it on the southeast branch.

It's just that you can share weal and woe, and cultivate more feelings.

"Oh well."

Xiao Qingzi had no opinion at all, and she smirked at Xiaoxiao: "Sister Xiaoxiao, I am also punished."

Don't you think it's an honor to be punished, kid?

Gently poked Xiao Qingzi's face with her fingers, it was smooth and elastic. Xu Ang was about to poke Xiao Gouzi in the face, but Xiaoxiao opened her mouth, revealing her little baby teeth, threatening to bite you if you dare to poke me.

"Brother Xu Ang, what about me, what about me, and me."

Sibao hopped anxiously beside Xu Ang and motioned to Xu Ang: Look here, there is still a little sister who has not been hung up.

"you?"

Xu Ang gave her a sideways glance and asked her, "Have you finished your homework? Have you solved the advanced math problems I assigned you? How many pages have you read in calculus? How about the experience of the overview of geometry? Let me see it."

A series of soul tortures made Sisi's face collapse instantly. She whispered, "It's done, it's done."

It is done, but the subject is difficult.

At least it made Sisi feel the difficulty. What Xu Ang said was much more difficult than the topics in the high school textbooks she had read before.

In the past, Sisi could easily learn by flipping through the book, but starting from advanced mathematics, to the calculus that Xu Ang had recently introduced her to, Sibao started scratching her head. These new knowledge made her bald.

Xu Ang had privately thought about how long Sisi's hairline would last.

After checking Sisi's homework, Xu Ang found that the girl was indeed talented in mathematics, and she could keep up with the relevant courses in the freshman year of Peking University.

Although it was a little difficult to follow up, and her learning was obviously not as fast as in middle and high school mathematics, Xu Ang knew that it was just that Sisi was not used to the explosion of knowledge points in college courses, and she would be fine when she got used to it.

Closing Sisi's workbook, Xu Ang was thinking: Do you want to go to the school's mathematics department and give Sisi some more professional courses?

Flipping through her workbook, Sisi asked, "Brother Xu Ang, why are you writing this?"

Do math problems just do math problems, why let yourself write the experience and experience of reading books, this is not fun at all.

Sisi would rather do a few more calculus than write this.

Touching her little head, Xu Ang said to her: "The real purpose of learning mathematics is not to solve problems, but to solve problems is just a means to achieve the goal. Si Baobao, you know that learning mathematics is like the word for fennel bean. There are four What kind of spelling?"

Sisi shook her head.

What is fennel bean, it sounds like eating, is it delicious, is it sweet and delicious with bonbon?

"The first level of learning mathematics is the foundation, which is to memorize the formulas in the book. It is no problem to pass the exam at this level. The second level of induction is to prepare a wrong question book, write down all the wrong questions on it, and then Set a time for yourself, and how often do you take out the wrong questions and redo them. When you do the questions, you can't just do the questions. The point is to sort out the knowledge points on the wrong questions. You need to sort it out and try to redo it every time. You can master one more knowledge point. The third level is proficiency, after-school exercises in the book, and the questions written down in the wrong question book, you have to do periodic exercises, and deepen your impression by doing the questions many times. Do this step , the math scores can be good, and it is enough to cope with the entrance examination to this stage.”

"What about the fourth floor?"

Sisi raised her little head and asked.

She likes math. Brother Xu Ang is better than her. She is willing to ask brother Xu Ang for advice. If it were someone else, such as her sister Liu Ruoxi, Sisi would not listen to her.

"The fourth layer is mathematical logic. Mathematics is the foundation of the modern scientific system, and it has a complete and rigorous logic. If you want to go further on the premise of achieving the first three points, you must understand the logic of mathematics. This is similar to economics. A truth, you can only see the essence through the phenomenon if you understand its underlying logic. No matter how the above changes, you can know it and know why. Instead of watching today's regulation tomorrow's rate reduction , The day after tomorrow, it was rumored that the interest rate would be cut, and I was in a fog, and I didn’t know if I should enter the venue, and if I did, when would I enter the venue.”

"what?"

Sisi was confused.

Xu Ang said to her: "My brother asked you to write your experience after reading this overview of geometry, not to let you brush the exercises, but to let you understand how the person who wrote this book thinks about mathematics and how to think about mathematics. Not only this One, and I will show you more theoretical books to read in the future, all of which have to be written about my experience.”

Sisi looked terrified.

With a bitter face, she almost didn't cry to Xu Ang on the spot.

She would rather hang it on the hanger than to write and read the book.

If I knew it would be like this, I wouldn't jump out to brush my sense of existence.

"Si Baobao, come and let me hug you."

Xiaoxiao saw that Sisi's eyes, nose and eyebrows were all wrinkled. She wanted to comfort Sisi, encourage Sisi, and make her a strong Sisi baby.

My brother even wants to bully Sibao, it's bad.

Xiaogouzi was muttering.

In order not to let Sibao really be bullied and cry, and then be known to beat her brother's palm by her mother, Xiaoxiao is determined to coax Sisi well.

The elder brother is ignorant, and the younger sister is annoying.

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