Han Du's face darkened, and he said earnestly: "Girls, don't read books without swallowing them whole. Mathematics is called the language of all things in the world. 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 wisdom? 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 what Han Jingyun said next made Han Du's heart shake to pieces.
"But I have 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 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 scowl on his face, 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 just 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 even 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, 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 move around.
But now Han Jingyun's boudoir is clean and tidy, no different from a lady's boudoir. Perhaps the only difference is that there is a math book given to her by Han Du on the desk, as well as a neat stack of
Drafts or notes are placed on the left hand side.
Han Jingyun handed the math book and the draft to Han Du to read.
Han Du hesitated for a moment and reached out to take it.
The more he opened it, the more surprised Han Du was! The previous additions, subtractions, multiplications and divisions were okay and quite satisfactory. Starting from the equations at the back, the painting style changed and became incompatible with Han Du's cognition.
When Han Du was solving problems in the past, he would be thankful if he could think of a solution. Most of the time, he couldn't even think of a solution, and he needed careful guidance from the teacher.
But what Han Du has seen now is that Han Jingyun has more than one solution to many questions, and many even have more than three solutions.
Han Du quickly opened the book in disbelief, and soon he had finished reading it all. He closed the book, sat down on the stool, looked at the girl blankly, and murmured: "So, you said you have completely finished studying
, is it true?”
How is this possible? In just a few days, she has 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 top student in mathematics. However, when a top student like him first learned these things, it was difficult for a guy like him to face a genius like a girl.
At that time, I could only tremble.
"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. He didn't even know what to say. He just wanted to calm down his heart.
Taking two deep breaths, Han Du's face regained the confidence of his elder brother. He touched sister Jingyun's hair and said with admiration: "Yes, she is indeed my sister. She is very smart. Oh, you can learn this quickly.
, half as charming as my elder brother.”
Ahem, Han Du himself didn't believe what he said. But there was no way. Not only did he say these words, but he also said them without blushing and his heart skipping a beat. Otherwise, wouldn't his brother's prestige be completely wiped out?
"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?" Not wanting to let the girl continue chasing him on this issue, Han Du quickly changed the subject.
Sister Jingyun was still too young and had no doubt that there was something wrong with Han Du's words. When Han Du asked her, she said directly: "That's it. When I was solving the inequalities, I felt that this book seemed to only briefly mention
For a moment, it seems that the deeper content has not been mentioned, so I asked the elder brother if there is anything else below."
"inequality?"
"Yes, well, how do you say it? I think inequalities are quite interesting. We talk about equality a lot of the time. 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 a numbness in his scalp. Except for the greater than symbol, which made Han Du understand that this was an inequality, Han Du's heart trembled when he saw it. I also want to know whether this inequality is true.
, but it’s a pity that it knows me, and I don’t know it?