Chapter 1 Adventure
The summer sun was shining brightly in the sky. In the afternoon, the sky was filled with a scorching heat. Even the cicadas had no energy to sing. Wu Tong sat at her desk. The air conditioner was set to 25 degrees, and the cold air was circulating in the room. But she still felt very irritated.
Given the universal set U=R, the set M={x∈Z|-1≤X-1≤2}, and the relationship Venn diagram of N={x|x=2k, k∈Z} is shown in the figure. How many elements are there in the set represented by the shaded part in the figure?
How many are there?
Wu Tong really didn't understand how she, a 28-year-old working woman who had been away from the classroom for ten years, could remember the questions from high school.
Wu Tong frowned and rubbed her brows in frustration. Who could have thought that when she woke up from her coma, she would be back to the summer vacation of her first year in high school and become a willful, ignorant and unmotivated poor student.
Her head ached, and the scene of her father dying in a car accident and her mother in the emergency room, her life or death uncertain, appeared in her mind.
His heart felt like it was being pulled apart... The piercing pain made Wu Tong breathless.
The pen in his hand broke suddenly on the desk, and Wu Tong looked at the test paper in front of him.
There's still time for everything.
It's only 2009 now, she's only sixteen years old, and she's still preparing for the college entrance examination!
Wu Tong tried hard to concentrate, even half-heartedly thinking, if only there was something that could help her concentrate and get rid of distractions!
Just when I was about to complain about my lack of concentration, I started dreaming before I even fell asleep!
Suddenly, a feeling of coolness and tranquility slowly spread from the depths of his mind, making Wu Tong feel as light and energetic as if he were eating an icy watermelon in the dog days of summer.
In just a short while, Wu Tong had vaguely grasped some clues to the problem that had been bothering her just now from her limited knowledge base, and she had some ideas. It seemed that she could start with the intersection operation of the two sets M and N.
Is this, pie in the sky?
Or is it her illusion?
If it was an illusion, the idea of solving the problem that emerged in her mind was not false. This was a knowledge point that she could never remember now. The teacher had talked about it at that time, but she didn't listen carefully back then.
At this moment, she was fully focused. She dug out the knowledge points that she had only heard of before, connected them together from point to surface, and formed a way of thinking to solve the problem.
To describe it in one sentence, this is called the spark of inspiration.
If possible, Wu Tong certainly hopes that this is real and not a one-time existence.
To verify, Wu Tong once again carefully examined the question, and the clarity of mind emerged again. All the distracting thoughts in his mind disappeared, leaving only the concentration on solving the question carefully and following the train of thought just now.
The set shown in the shaded part of the figure is MnN···
∵M={x∈R|-1≤x-1≤2}={x∈R|0≤x≤3}, and N={x|x=2k, k∈Z},
∴M∩N={0，2}
Therefore, there are 2 elements in the set shown by the shaded part.
After writing down the whole thing with great pleasure, the answer came to him, and Wu Tong really felt the joy of doing the test.
If learning were so comfortable, then studying all the time would be a happy enjoyment rather than a torture of anxiety!
How many people desire to be able to write beautifully!
The sudden encounter made Wu Tong extremely surprised, and at the same time curious and puzzled, where did this opportunity come from? Thinking that the initial source of that magical feeling came from the depths of his mind, Wu Tong could not help but close his eyes and concentrate his thoughts to feel it carefully in the depths of his mind.
Her heart gradually calmed down. Suddenly, Wu Tong felt that her consciousness had suddenly come to a magical place. Her thoughts became clear and a surge of enlightenment came to her mind. This was the deepest part of her sea of consciousness. In it, a slightly damaged black jade stele stood quietly. Even though it was damaged, the jade stele still glowed and was moist and crystal clear.
Wu Tong's consciousness tentatively approached the jade stele, and she was enveloped by the jade stele's calm and steady aura. A warm current quietly flowed into her heart, and all the consequences naturally emerged in Wu Tong's mind.
There is a strange thing in the world, called the Enlightenment Stone, which is a natural monument with the miraculous effect of understanding the truth of the world. However, as time goes by, the Enlightenment Stone is now broken and only has the ability to calm the mind and assist the thinking process to deduce errors and omissions, and is on the verge of extinction.
Today, it is activated by the energy of the intersection of time and space, and the owner Wu Tong accidentally awakens his past life memories, blends them with the future, and catches a glimpse of a sign of the future.
But for Wu Tong, these minor abilities are already extremely useful aids to her. It is her blessing to be able to obtain them. She is not greedy to reach the sky in one step and become an immortal or a Buddha.
All the tragedies started from the fact that she deliberately didn't study well after this summer vacation. Now with the warning bell of her past life memories and the help of the enlightenment stone tablet, the first step to change her destiny is to study hard.
Studying step by step and mastering more knowledge, becoming the pride of parents, becoming a useful person, and being able to control her own life. This is the path that parents are most satisfied with and the best path for her to develop.
In her previous life, she was tired of repetitive work and had no real understanding of the world. Although she knew that technology would develop by leaps and bounds in the future, she did not understand the principles behind it. She knew that housing prices in big cities would become higher and higher, but now she and her family did not have the money to buy a house in a big city.
Knowing that someone will win the lottery, tens of millions or hundreds of millions, so what? Her memory does not include lottery numbers.
Her family is ordinary like most people in the world, living in a small town in Xincheng County, Tianzhong City, Central China. Her father, Wu Jingzhong, is a civil servant working in the county agricultural bureau, and her mother, Jin Yu, is a primary school teacher teaching mathematics in the county primary school. The family is not rich, but basic living can be guaranteed.
She doesn't pursue extravagance and her financial situation isn't that bad, so there's no need for her to immediately go out and earn money.
There is a golden house in books. If you study hard, you can also make money.
She seemed to have heard in her previous life that a mathematician solved a mathematical conjecture and was rewarded one million.
She didn't know where her limit was, but in terms of personality, she was not good at socializing, and she was most suitable for research-oriented work. Moreover, she now had the help of the Enlightenment Stone, so perhaps she could also achieve such glory!
Studying diligently, acquiring knowledge, and comprehending knowledge can also become nutrients for the Enlightenment Stone, nourishing and repairing the Enlightenment Stone. They complement each other and make each other perfect.
In addition to the source, the Enlightenment Stone also gave Wu Tong a set of body-strengthening exercises, which Wu Tong named the Morning Sun Purple Qi Method. She used herself as a medium to absorb the purple qi from the rising sun every day, and combined it with special breathing to enter her limbs and bones, nourishing every part of her body. Although it did not have the miraculous effect of changing one's fate, it could strengthen muscles and bones, enhance physical fitness, and prevent serious diseases.
Unfortunately, the inhalation of the morning glow purple energy is only suitable for her own use, which is based on the coexistence of the enlightenment stone tablet and her. However, she studied and simplified the breathing method, which can be given to her parents to use with soothing exercises to strengthen their bodies. With a good physique, there will be fewer diseases to bother them. At least they should strive to live a long life of more than 100 years and die without illness.
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