Wukong tried his best to borrow a banana fan and was cheated by Niu Wangmo, the husband of Princess Iron Fan. So Wukong and Niu Wangmo started a big battle.
Niu Wangmo is no match for the Monkey King. He was exhausted and fled. However, Niu Wangmo is not simple, he will change. Seeing Wukong chasing after him, he turned into a white crane and flew away. As soon as Wukong saw it, he immediately turned into a phoenix and chased it.
Niu Wang Mo thinks: Phoenix is the king of birds. I am a white crane, how can I compete with this phoenix? ! He had no choice but to fly off the cliff, become a fragrant roe, and pretend to eat grass leisurely in front of the cliff. Wukong thought, What a genius! You can't fool my old grandson! He immediately turned into a hungry tiger and jumped at it. Cow king panicked and quickly turned into a lion to catch a hungry tiger. Wukong saw it clearly, rolled on the spot, turned into a giant elephant, opened his long nose and rolled the lion in.
Niu Wangmo did his trick and showed his true colors. It turned out to be a big white cow. The horn of this white cow is as strong as an iron tower, reaching more than 8,000 feet, with infinite strength. He said to Wukong:
"What else can you do to me?"
I saw Wukong bent down and shouted "Dragon"! Immediately, the tall man walked to the cow with a big iron bar. Seeing that the situation was not good, the cow had to restore its original image and escape.
The killing of the Monkey King and Niu was earth-shattering, which shocked the immortals in the sky and rushed to help besiege Niu.
Niu Wangmo, who was trapped by wild animals, became a big white cow. He slammed King Tota with an iron horn, and Nezha yelled loudly with a steam wheel. Finally, the king fixed it with a magic mirror. He couldn't move, so he had to beg for mercy, give a banana fan and put out the fire fan in the Flame Mountain. Four monks in the Tang Dynasty climbed mountains and mountains to continue their western learning.
This story is very attractive and related to the function concept of algebra in junior high school.
First of all, let's start with the word "change". The Monkey King and Niu Wangmo are both miracles and can be changed. They can become birds and animals; After drinking a large glass, your body can stand upright or become a bug.
Of course, these are myths, not real facts. However, everything in the world is changing. As matter is changing, the number representing its quantity will naturally change. This tells us that we should study numbers and quantities and their relationships with changing viewpoints.
Secondly, let's take a look again. Are all quantities variable under any circumstances? That's not true. In a certain process of studying a problem, some quantities are constant within a certain range. In other words, although it is changing, the change is very small, and we regard it as constant. Let's take the Tang Priest as an example.
The Monkey King has the greatest ability and can change 72 changes; Tang Priest is the most useless, and he will not change at all. The monster can recognize him at a glance. Everyone wants to eat his meat. In algebra, the ever-changing quantity in the process of studying a problem is called a variable, and the Monkey King is like a "variable"; A quantity that remains constant within a certain range is called a constant, and Tang Priest is like a "constant".
In addition, let's see if there is any connection between variables. Variables don't change there in isolation. In the process of change, variables are closely related and mutually restricted. Nevertheless, according to the above story, both the Monkey King and Niu Wangmo are changing.
Niu Wangmo became a crane, and the Monkey King became a giant elephant; Niu Wangmo has become a big white cow with a height of more than 8,000 feet, and the Monkey King has also become taller ... Here, Niu Wangmo always changes first, and the purpose of his change is always to try his best to escape; The Monkey King changes with the change of cattle. Moreover, this change has certain principles.
The cow has changed something, and the Monkey King has changed something that can subdue the cow. In algebra, we call this first variable an independent variable, and the variable that changes with the independent variable is called a function. A principle that a function changes with the change of independent variables is called the correspondence of functions. As mentioned earlier, the Monkey King is like Niu Wangmo's "function", which changes with the change of Niu Wangmo.
Therefore, Journey to the West has a lot to do with our mathematics! In fact, as long as we pay attention, mathematical principles are everywhere.