No, look, it’s over. What does that mean?
Han Du's face darkened, and he said earnestly: "Girls, don't read books without swallowing them whole. Mathematics is called the language of heaven and earth. It is best at broadening people's thinking and increasing people's wisdom. Do girls want to be a strange woman who shows off her appearance and is smart at heart? What if? If you think about it, then this mathematics is your best choice. Believe me, it’s true.”
"Of course I believe what brother said, and I also feel that this mathematics is indeed magical." Han Jingyun nodded lightly.
When Han Du looked at such a girl who was so easy to fool, he felt a sense of comfort and happiness.
But Han Jingyun's next words shook Han Du's heart to pieces.
"But I've finished reading all the mathematics, and the problem solving is boring. I feel that there should be more advanced parts of mathematics. That's why I came to ask for help."
Han Du was stunned, and after a moment he asked in disbelief: "You, what did you say? It's only been a few days, and you've already learned all the mathematics? Have you solved all the questions I left?"
"Yes." Han Jingyun said with a smile.
He tilted his head and said with a sudden realization: "It turns out that the questions in that book were all left by my eldest brother, but those questions are quite simple. Isn't it that, eldest brother, you take care of my sister and me?"
Simple?
The nerves at the corner of Han Du's mouth suddenly twitched uncontrollably. The exercises he specially used to make things difficult for the girl were actually called simple by her?
Han Du can still remember that when he did those questions, he almost died from the frown, but now it has become an easy question in the girl's mouth?
"Are you really done? You didn't write it randomly, did you? Brother wants to check it carefully for you." Han Du still couldn't believe it. How could the gap between this person and other people be so big?
"Okay, I'll let my elder brother give me some advice." Han Jingyun was very happy. In her eyes, Han Du was the most powerful in her eyes since she was rescued from prison by Han Du.
Moreover, this math book was written for her by her eldest brother. Since the eldest brother can write it out, he is naturally more powerful.
Han Du remained silent all the way and followed the girl to her boudoir.
The situation in the boudoir was a little different from what Han Du had imagined. According to Han Du's idea, the girl's current boudoir should be filled with books on the table, and paper balls thrown everywhere on the floor, making it impossible to get around at all.
But now Han Jingyun's boudoir is clean and tidy, no different from a lady's boudoir. Perhaps the only difference is that on the desk is the math book Han Du gave her, as well as a neat pile of drafts or notes placed on the left hand side.
Han Jingyun handed the math book and the draft to Han Du to read.
Han Du hesitated and reached out to take it.
The more he opened it, the more surprised Han Du was! The previous addition, subtraction, multiplication and division were okay and quite satisfactory. You can start from the following equations, and the style of painting has changed, becoming incompatible with Han Du's cognition.
When Han Du was solving problems in the past, he could think of a solution, which was a matter of gratitude. Most of the time, I can't even think of a solution, and I still need the teacher's careful guidance and guidance.
But what Han Du saw now was that Han Jingyun had more than one solution to many questions, and many even had more than three solutions.
Han Du opened it quickly in disbelief, and soon he had opened it all. He closed the book, sat down on the stool, looked at the girl blankly, and murmured: "So, what you said that you have completely finished studying is true?"
How can this be? In just a few days, she has already learned what others need to learn in six years?
Thinking of this, Han Du couldn't help but think of a sentence that appeared in a TV series. "When I know that one day of study is equivalent to one year of study for others, I know that I am a genius!"
What a genius indeed!
Han Du's own mathematics is not bad, and he can be regarded as a mathematical master. But even a top student like him found it difficult when he first learned these things. A guy like himself can only tremble when facing a genius like this girl.
"What's wrong, eldest brother?" Han Jingyun couldn't help but asked worriedly when he saw his eldest brother's eyes were lifeless and he looked like he had lost hope in life.
"Oh, no, nothing?" Han Du came back to his senses and didn't even know what to say. I just want to calm down my heart first.
Taking two deep breaths, Han Du's face regained his brother's confidence. He touched Jingyun's girl's hair and said with admiration: "Yes, she is indeed my sister. She is very smart. Oh, you can learn this quickly. You are half as elegant as my elder brother."
Ahem, Han Du himself didn’t believe what he said. But there is no way, not only should I say these words, but I should also say them without blushing or heart beating. Otherwise, wouldn't his brother's prestige be completely lost?
"Well, I will work hard and try to catch up with big brother." Sister Jingyun clenched her fists and said with narrowed eyes.
Ahem...
Han Du doesn't know why he coughs more today. Maybe he has a cold...
"By the way, how do you know there is content behind this mathematics?" Han Du didn't dare to let the girl continue chasing him on this issue, so Han Du quickly changed the subject.
Sister Jingyun was still too young and had no doubt that there was anything wrong with Han Du's words. When Han Du asked her, he said directly: "That's it. When I was solving inequalities, I felt that this book only mentioned it briefly, and the more in-depth content didn't seem to be mentioned, so I asked the elder brother Is there anything else down there?”
"inequality?"
"Yes, well, how should I put it? I think inequalities are quite interesting. We talk about equality a lot of time in this world. I didn't expect that there is something special about inequality in mathematics." Han Jingyun said casually with a smile.
"Oh, by the way. When I was solving inequalities, I made an inequality myself. Brother, can you help me see if this inequality is true? Anyway, I think it is true." Sister Jingyun didn't notice that Han Du's face turned a little brighter. Hong enthusiastically wrote out the inequality she created and showed it to Han Du.
Han Du looked closely, "The square of a minus the square of b, divided by..."
Before he finished reading, Han Du felt his scalp numb. Except for the greater than symbol, which made Han Du understand that this was an inequality, everyone else saw Han Du's heart trembling. I also want to know whether this inequality is true, but unfortunately it knows me, and I don’t know it?
