"I'll start with integers, natural numbers, and the four arithmetics, and I'll write down the main points as I go......"

On the first floor, Bi Luo sat at a low table with a candle on the table, and Fei Cai stood aside and began his first math lesson.

In fact, Biluo is able to perform simple operations such as addition, subtraction, multiplication and division, but that is mostly from the practical experience summed up in agricultural activities, after all, it is not as systematic and standardized as in modern mathematics, so Fei Cai decided to start from the beginning.

However, in order to achieve the goal of speed, Fei Cai decided to skip many contents that have little to do with calculus, such as probability theory, solid geometry, etc., and he is not going to talk too deep about many basic knowledge, just enough to lay the foundation for calculus.

The four operations themselves are very simple, and Fei Cai quickly finished them. The first exercise is to memorize a nineteen times nineteen multiplication table.

Yes, not a ninety-nine multiplication table, but a multiplication between all integers up to nineteen. The reason for this is that according to Fei Cai's experience, the ninety-nine multiplication method will not be very sufficient in the future. Fei Cai himself can recite multiplication within 19, and improve the starting point at the beginning, which helps to cultivate number sense, and can have a multiplier effect on subsequent learning.

The nineteen multiplication table is actually not difficult to memorize, Biluo itself is very smart, and Fei Cai has also prepared an artifact - a strong natural app.

When Biluo was asleep, he deliberately consumed an instant exchange charm to exchange for a pair of things needed to learn mathematics, including a smartphone and the "Fierce Practice" App installed in it. This time, he also deliberately exchanged for a domestic mobile phone, no way, Samsung will explode......

Fei Cai said, Biluo wrote, and the girl quickly wrote the nineteen multiplication table on a large piece of paper. Seeing that the other party finished writing, Fei Cai took out his smartphone and put it in Biluo's hand.

"Click here. He pointed to the app icon on the screen.

"What is this?" asked Biluo curiously.

"Something that strengthens your wisdom. Fei Cai explained. "The divine law is a law created by a witch god, and it is extremely difficult for a mortal to understand every point. This thing will strengthen your wisdom in a short period of time and speed up the speed of learning the Divine Law. ”

"I see, thank you, Lord God!" Biluo said busily. "But is it really that difficult? The divine law you just taught me called the Four Laws of Arithmetic doesn't seem to be too difficult...... Ah, I don't mean to be disrespectful to the witch god, please don't blame ......"

When Fei Cai heard this, he laughed instead: "How can I blame you? To be honest, it would be nice if you had always thought it was simple! But this possibility is too small." I guess when you learn about 'factorization', you'll have your first hurdle. But for now, let's memorize the nineteen multiplication table. ”

"Yes, I want to learn how hard it is to learn how hard it is. Perhaps it was because he found that this divine envoy was unexpectedly approachable, and what Biluo said to Fei Cai gradually became lively.

Next, she followed Fei Cai's instructions, ran the natural strong software, and began to read aloud the nineteen multiplication table.

With the invincible learning plug-in of fierce practice and natural strength, Biluo took less than an hour to memorize the entire multiplication table upside down.

But the endless after-school contact had just begun, and Fei only called up another divine book from the library in his mind - "One Lesson and One Practice".

Speaking of this "One Lesson and One Practice", it is very famous. Fei Cai was deeply hurt by it when he was a child, and when he became an adult, he once happened to see the news that the British Department of Education was preparing to introduce an English version of "One Lesson and One Practice" to improve the mathematics level of British students, and he immediately had a sense of fascination......

And now, "One Lesson and One Practice" has even been taken to another world by Fei Cai, and if the writer of this book knows, I don't know if he will be very pleased.

It's a pity that Biluo didn't know simplified Chinese characters, so Fei Cai had to translate the question in his head into the Wu language, and let the other party copy it on paper first, and then do the exercises.

This day's teaching lasted until four o'clock in the morning, and when it ended, Biluo was still a little reluctant, Fei Cai saw her appearance, but smiled: "Don't worry, there are more topics to do next!" After speaking, he forced her to sleep.

During this time, there was nothing to worry about in Biluo Village. The construction of the altar was carried out in an orderly manner under the auspices of Yan Li, and the villagers who did not participate in the construction of the altar were doing their daily farm work unhurriedly as before. All in all, the days were smooth without a single wave.

Unlike most of the protagonists of farming, Fei Cai is not in a hurry to improve the livelihood of the people in the village, and most of his daily energy is focused on teaching Biluo.

The witch girl is very motivated to learn.,Plus the mind is smart and has a plug-in.,Progress is very fast.,About half a month,Fei Cai finished teaching the elementary school curriculum.。 Although she still didn't have a firm grasp of some knowledge points, Fei Cai was not ready to let her spend time consolidating, but directly started the junior high school course.

At this stage, in addition to the "One Lesson and One Practice" that must be done after class, Fei Cai added a more difficult practice textbook - "Three Points and One Test".

This evil "Three Points and One Test", Fei Cai is very impressed, the first questions in each chapter are okay, the more difficult it is to the back, Fei Cai still remembers that when he was in junior high school, the homework assigned by the teacher "Three Points and One Test", he either made excuses and didn't bring it, or he copied the class to go to school. At that time, the most common conversations between him and his math teacher were as follows:

Teacher: "Why didn't you turn in your homework this time?"

Fei Cai: "I forgot to bring it." ”

Teacher: "If you didn't bring it, you didn't write it!

......

Although Fei Cai was not serious about himself in the past, he is not relaxed at all in his requirements for Biluo. Since entering the junior high school course, the witch girl has finally begun to gradually appreciate the horror of the sea of questions.

But that's just the beginning......

Soon, factorization revealed its hideous face to Biluo.

In order to lay a good foundation for the future study of functions, analytic geometry and even integrals, Fei Cai's requirements for Biluo are not the kind of one-dimensional quadratic, a formula or factorization that can be seen at a glance. All kinds of extraordinary, quadratic or even triple, quadruple, binary and even ternary factors were all found by him from the question bank, and he launched a round bombardment of Biluo mercilessly.

At the beginning, when assigning the exercise, the conversation between the two is as follows:

Fei Cai: "Today, you need to complete all the exercises on these five pages. ”

Biluo: "Huh, is that all? If I'm done soon, I'll ask the Divine Envoy to arrange some more for me!

Ten days later, Biluo's eyes began to become trance-like when she looked at the topic.

Fei Cai: "Today, you need to complete all the exercises on these ten pages, the following questions may be a little difficult, if you can't solve it after thinking about a stick of incense, just do the next one, and finally I will explain the problems that can't be solved." ”

Biluo looked at the ten pages full of questions and showed a very reluctant smile: "Yes, Lord God's Messenger, I will ...... Refueling ......"

Twenty days later, "Three Points and One Measurement" had already been completed, and Fei Cai had already begun to use the "Huanggang Secret Scroll" of the previous years, and during this time, he had finished the content of plane geometry.

"Today's task is these ten sets of test papers, I have crossed out all the questions I have not learned, and I have to do all the rest. Each set is done in 90 minutes, uh...... Last time I introduced the concept of minutes, you remember, you can know the time by looking at your phone. ”

"......" Biluo lowered her head and didn't say a word.

"What's wrong?" Fei asked.

As a result, the other party seemed to have just heard Fei Cai's voice, and suddenly came back to his senses: "Huh, ah! hug, sorry...... My lord, I don't know how to get distracted, is it ten sets of test papers this time? I know, I'll start ...... now."

Seeing that the witch girl's eyes not only became a little dull, but even her tone became mechanical, Fei Cai couldn't help but feel a little distressed. But if you want to master various mathematical skills in a short period of time, except for high-intensity problem solving, there is no shortcut at all, and Fei Cai has to do this.

Wait for this time to pass, and then let her rest and recover...... He thought.

However, a month later.

The development of things was completely unexpected by Fei Cai - the soul of the scholar hidden in Biluo's body seemed to have awakened......

Moreover, she also learned one word: brush questions.

Fei Cai: "How about today?"

A trace of dissatisfaction flashed in Biluo's eyes: "Fifteen sets of 'Huanggang Secret Scrolls'? It's a little less! I'm going to brush off a thousand questions today! Lord Divine Envoy, please prepare some!"

With that, she grabbed a ballpoint pen and began to write quickly.

Yes, just some time ago, the witch girl thought that the brush was too slow to do the questions, and she had learned to use a ballpoint pen......