Li Tai frowned and thought, the problem in front of him was really difficult.
The young people around him were also racking their brains and thinking.
The Tibetan man who asked the question said: "It is said that His Majesty the Tang Dynasty was revered as the Khan of Heaven. I didn't expect that the young people of the Tang Dynasty could not even solve such a simple question."
"Don't say such arrogant words!"
Someone shouted immediately.
The Tubo man smiled and said: "The villain is just talking about the current situation."
"Then how do you want to measure it?"
"What will you do if the villain says it?"
"..."
The Tibetans dance in front of you and taunt you.
As long as the provocation is in place, the Tubo man's goal will be achieved.
Of course there are people who are not convinced.
At this moment, there are more people who want to beat this Tubo man.
But everyone is gentle in front of others, but I don’t know how cruel they are behind others.
Under the tough folk customs of the Tang Dynasty, someone might find this Tibetan man lying bruised and half-dead on Zhuque Street early tomorrow morning.
The wonderful Hungry Ghost Festival was completely ruined by this Tubo man.
The onlookers were whispering to each other and discussing constantly.
Someone has already gone to invite someone from the Imperial College.
Zhang Yang looked at the Tubo man with interest.
Today, Li Shimin is revered as the Khan of Heaven. This is when Li Shimin is satisfied with his ambition.
Li Shimin still didn't know that in the west of the Tang Dynasty, a man named Songtsen Gampo was also working hard.
And Xue Yantuo is also constantly causing trouble.
Tuyuhun is also eager to try.
There are so many hidden dangers at the border.
Fortunately, Li Shimin was able to eat well and sleep well.
It won't be long before Songtsen Gampo starts to set his sights on the Central Plains, he will lead Tubo and Li Shimin to arm-wrestle.
In addition, there is a plateau in Tubo. Even if Li Shimin wanted to send troops to attack Tubo, he would not be able to avoid altitude sickness.
Moreover, Songtsen Gampo was not a good guy. He became the Tubo Zampu at the age of thirteen.
There have been constant wars within Tubo in the past two years. Songtsan Gampo has been upgraded and accumulated experience for so long. In one year, Tubo will be unified. Songtsan Gampo's next target is the Tang Dynasty.
He is young and is now the king of Tubo. He needs a battle to establish his authority.
There is nothing better than using the Tang Dynasty to give Songtsan Gampo his prestige.
Military affairs are too complicated, and they have nothing to do with me.
Seeing more and more people watching, Li Yue whispered to Zhang Yang, "Is it true that you can know how tall this tree is without touching it?"
Zhang Yang sighed: "How do I know?"
Looking at Zhang Yang with a frown, Li Yue said, "You must know."
After getting to know each other for such a long time, Li Yue discovered that Zhang Yang had a very special ability.
No matter how difficult the problem is, it will be solved with ease in Zhang Yang's hands.
So much so that Li Yue was lying flat for a long time.
Life is dull and worry-free.
"You said it or not."
Feeling Li Yue's little hands tugging at the flesh of his arm.
This strength...
Zhang Yang whispered: "Harder... yes, harder."
"..."
"伱!" Li Yue raised her fist and hit Zhang Yang like raindrops.
However, Li Yue never learned how to curse, so she could only express her anger with small fists.
Zhang Yang said in a low voice: "I helped them because of your face. You have to think about it, even if I help them, I won't get any gratitude from these people."
As he spoke, Zhang Yang glanced at the young people watching.
They will only ridicule the Tibetan man's arrogance after the mystery is solved.
As for how the puzzle is solved, no one cares at all.
Zhang Yang usually avoids such things.
To make your little wife unhappy is to make yourself unhappy.
Zhang Yang looked up at the evening sun.
I picked up a fairly straight stick from the ground.
It's very simple to solve this problem, it's just an elementary school math problem.
The height of the tree can be found by finding a few known conditions.
The key is still a matter of way of thinking.
Most of the scholars in the Tang Dynasty read Confucian classics, the Book of Songs, and some articles that have been circulated in the world.
There are not many people who specialize in mathematics.
After all, the first element of being an official is to write well.
It is a very thankless thing to study obscure and brain-wasting mathematics when you have nothing to do.
Even if you have achieved something, you can write a lot of algorithms.
There are a few people who can understand.
It is better to write a good article that everyone can understand, so as to win the appreciation of others.
When considering cost and efficiency, ancient people generally preferred to be liberal arts students.
Looking at this group of young people, Zhang Yang picked one of them and said, "Brother, please take a step to speak."
The young man looked at Zhang Yang curiously and said, "May I ask what's wrong?"
Zhang Yang whispered to him: "Actually, this riddle can be solved."
"How to solve it?"
Zhang Yang stuck a wooden stick on the ground and said, "Now measure the length of this piece of wood."
The young man tried it with a measuring stick and said: "There are three in a foot!"
Zhang Yang said to him: "Put this wooden stick on the edge of the tree later. Remember to keep it aligned with the tree without too much deviation."
The young man nodded blankly, still looking at Zhang Yang with a strange expression.
Zhang Yang marked the edge where the stick was inserted into the ground, and then said to him: "Measure the height of this stick. Later, insert the stick there, measure the height of the stick, and then measure the shadow of the stick." length."
"Then you can measure the shadow of that tree. Do you understand what I mean?"
The young man scratched his head and said, "I understand somewhat. Please explain it more clearly."
"..."
Zhang Yang glanced at Li Yue again.
Li Yue squinted her eyes and smiled. I said in my heart that I knew you would, with pride on my little face.
The person in front of me seemed to be a little nervous about his math skills.
The sun was about to set.
Zhang Yang added: "At the same horizontal position, when the reference object remains unchanged, the distance between the shadow and the shadow is the same. Under the influence of light, our shadow changes with the angle of the light, but your and my height will not change. When If we stand side by side, will the length of our shadows change at the same time?"
The young man seemed to be suddenly enlightened, "I kind of understand."
Zhang Yang took a stick and wrote a formula on the ground and said: "Calculate the height of the stick and the length of the stick's shadow, and get the ratio of the two. Then measure the tree's shadow. Assume that the height of the tree is A."
"The length of the tree's shadow is calculated into the ratio just now, and then we work backwards to calculate the height of the tree. There will be some error, but it won't be too big."
"Yes, yes...that's it."
He almost jumped up with excitement, hurriedly walked into the crowd and shouted: "I know how to solve it."
Li Yue returned to Zhang Yang and said, "Do you think he can untie it?"
Zhang Yang said: "It should be okay."
Li Yue held Zhang Yang's hand and said, "Why don't you go by yourself?"
Zhang Yang snorted coldly and said: "To me, they are just mortals. Why should I show off how powerful I am in front of them."
Li Yue covered her mouth and smiled softly. He was such a low-key person who lived a low-key life without being in the limelight.
"Anyway, believe it or not."
after a while
The tree puzzle was worked out.
Everyone suddenly realized that this was actually not difficult at all.
The young man who solved the puzzle was smiling from ear to ear as he listened to the compliments from the people around him.
"Okay, you Tubo man! I call you arrogant!"
"You dare to act wild here, do you really think we haven't learned mathematics?"
"It turns out it's just a small skill. I thought it was so difficult."
…
As expected, they didn't care at all about how the problem was solved, they only thought about how to regain their previous face.
The Tibetan man saw that he was a little embarrassed at this moment, so he took out another jade pendant and said: "These two jade pendants are a pair. If you are really talented and knowledgeable, why not do another question? I will give these two jade pendants to the solution." The person in question."
Li Tai was still thinking about the process of solving the tree shadow puzzle in his mind.
Zhang Yang didn't want to get involved in what happened next.
But he saw this Tubo man walking directly in front of him.
Look at this guy's face full of resentment.
Zhang Yang pretended that nothing had happened, turned around and left. It is your business to ask questions and it has nothing to do with my answering questions.
After taking two steps, the Tubo man stepped forward to stop Zhang Yang. He said in unfamiliar Guanzhong dialect: "My friend, you must have solved the question just now."
"Ah."
Zhang Yang snorted coldly and said, "It's not me."
The Tubo man added: "Just now, the villain clearly saw that it was you who was telling him how to solve the problem."
I saw everyone looking at me. Zhang Yang found that he couldn't get off stage for a while.
The buddy who had just solved the problem also stepped forward and said: "Brother, since you have solved one problem, why not solve another problem to frustrate this Tubo man's energy."
Is this trying to flatter me?
The men and women around him looked at him.
Zhang Yang looked behind him and saw that Li Yue had stood not far behind him, looking at him expectantly.
The happiness and anger of these people have nothing to do with themselves.
Li Yue winked and stamped her feet.
It seems that she wants me to fight this Tubo man to the end.
Standing back, Zhang Yang looked at the Tibetan man and said, "Then come up with the question."
For a time, this place became the focus of the entire Qujiang Pool.
More and more people are watching.
Zhang Yang said: "Can you hurry up and give me the questions? I'm in a hurry."
In a hurry... Could it be that the Central Plains man in front of me is looking down on him?
The Tubo man thought for a long time and said: "There was once a man from the Western Regions who could cut off a small piece of gold from a square of large gold, and the shape of the original gold remained unchanged."
After the words fell, everyone who heard the question fell silent.
Someone passed the question on by word of mouth, and it was completely dark.
Zhang Yang killed a mosquito that didn't know whether to live or die, and flicked the mosquito's body gracefully.
"Are you done?"
The Tubo man bowed to Zhang Yang and said, "The villain has finished speaking. Please answer the question."
Zhang Yang made a square from the mud on the ground and said, "For example, this is a gold nugget."
While talking, Zhang Yang took out a piece of wood and cut several lines on the square, and then reassembled the cut pieces of clay.
Under the eyes of everyone, this square piece of mud was reorganized and indeed there was an extra piece in the lower left corner.
Zhang Yang cut off the extra piece and said, "This is the answer."
The Tubo man wiped his sweat. This question was actually a story, a story spread in the Western Regions.
Zhang Yang took the wooden strip and cut it again, dividing the square into several pieces again. The second time he cut the square in the same way, another small square appeared.
The original square shape remains unchanged.
It was quiet all around, and everyone's eyes were on the square that Zhang Yang was swinging.
What was happening in front of me was too magical, like magic.
The original square square can actually have an extra piece, and the square remains the same, with an extra piece appearing out of thin air.
