Cai Yong naturally also saw the infinite joy in the eyes of his eldest daughter's eyebrows, especially the shy look, which she rarely revealed when she was gentle and generous, and his heart sank, his daughter was so affectionate to this Zhang Liao, but what should she do?

This Zhang Liao's initial impression of himself is not bad, but he may not be worthy of his daughter, let alone let his daughter be his concubine! It's impossible!

But Cai Yong knows his daughter's temperament very well, and he will not change it if he decides it, if he doesn't agree, his daughter will definitely be very sad, but this is what he doesn't want to see. Pen? Interesting? Pavilion wWw. ｂiquge。 ｉｎfo

As soon as he thought of this, Cai Yong couldn't help but be annoyed in his heart, and he was even more angry with the Liao in front of him.

Seeing his daughter's happy expression again, but Zhang Liao's house was quite calm, and he was even more angry, in his opinion, his daughter was the best, and it was a blessing for several lifetimes to be able to favor this guy, and he was still indifferent! It's really hateful!

This is the mind of a father, on the one hand, he is worried that his daughter will like this guy, and on the other hand, he is angry that this guy has a mediocre reaction, of course, if Zhang Liao reacts, Cai Yong will also be angry, and he will marry a wife and come to provoke my daughter!

It seems contradictory, but it is so reasonable, in short, Cai Yong is not pleasing to the eye of Zhang Liao in front of him.

After more than a year, Zhang Liao saw the peerless red face again, and was a little distracted and at a loss at first, but he understood her intentions, and his mind must have calmed down, and then he became eager, with his cheeky skin, he made witty words for a while, and Cai Yan pursed his lips and chuckled, and his face glowed with unprecedented brilliance, Cai Wan and Cai Ying on the side couldn't help but look at her sister from time to time, I don't know why she is so amazingly beautiful today, and Cai Yong's face is getting darker and darker.

However, Cai Yong has rich experience after all, he didn't know the scenes on Hongnong Road at the beginning, and only thought that his daughter was fascinated by Zhang Liao's talent for a while, so he decided to suppress Zhang Liao with his erudition.

Therefore, he changed his expression with a smile and said, "Wen Yuan, I heard Yan'er say that you are proficient in mathematics, and it just so happens that the old man also knows a little bit about it, and he is about to ask you for advice." ”

Zhang Liao was stunned at first when he saw Cai Yong's sudden smile, but he was the best at observing words and colors, and immediately understood Cai Yong's plan, and couldn't help but be happy in his heart.

If Cai Yong relied on scripture or music to suppress him, it is estimated that he would be able to blow him to the ground as soon as he came up, but he chose a more out-of-the-way mathematical technique!

As for arithmetic...... Zhang Liao grinned, hugged his fists respectfully and said, "Don't dare to ask for advice." ”

Cai Yong looked at Zhang Liao's posture and immediately settled down: "Then let's learn a thing or two, the old man heard that Yan'er said that you are talented, but you can't let the old man down, and I hope Yan'er is not wrong." ”

Having said this, Cai Yong glanced at his daughter, this old man's intention was already Chiguoguo.

Zhang Liao could only make a helpless look, hugged his fists and said: "In this way, it is better to be respectful than to obey your fate, and ask your uncle to teach me." ”

Cai Yong nodded, and immediately ordered Cai Wan to get the calculation.

On the side, Cai Yong was disgusted and pretended to be a sweetheart, but she knew her sweetheart's numeracy, and her ideas were unparalleled, and she was no worse than her father, but at this time, she pretended to be frightened and helpless, obviously pretending to be a pig and eating a tiger in front of her father.

And although she admires her sweetheart's ingenuity and foresight, she really doesn't dare to compliment his scriptures, if her father chooses to test the scriptures, I'm afraid this sweetheart won't be able to hold on even for a round, and will be swept out of the house directly.

But her father chose mathematics, which made her feel funny, and felt that this was fate?

Soon, Cai Wan took out two cloth bags and poured out the counting chips, which were hundreds of small bamboo sticks more than one finger long, which were used to calculate the numbers.

Since ancient times, China has paid attention to mathematics, in the Spring and Autumn Period, there was a "ninety-nine multiplication song", to the former Han Dynasty there was already an "arithmetic book" and "nine chapters of arithmetic", including multiplication, contraction, square field, corn, decay, less wide, business merit, average loss, insufficient profit, equation and Pythagorean, etc., the content involves addition, subtraction, multiplication and division, square, square, area, volume, positive and negative numbers, Pythagorean, proportion and other fields, and has taken the decimal system for arithmetic, and the arithmetic chip is used for arithmetic.

Calculation chips can be placed into one to ten numbers, and there are two vertical and horizontal pendulum methods, when calculating, the single digit is vertical, the ten digits are horizontal, the hundred digits are vertical, the thousand digits are horizontal, and so on, and the zero is empty.

This method of arithmetic is very clever in the early days, but the problem is that there are too many calculation chips used in each calculation, often using hundreds or more, and if one is wrong, there will be mistakes.

At this time, the "Nine Chapters of Arithmetic" was only a text description, and did not put forward a systematic arithmetic concept, let alone any derivation and proof, so arithmetic is extremely esoteric for ordinary people, difficult to promote, and those who are good at it are often because of the complex method, it consumes dozens or hundreds of times more energy, and it is easy to make mistakes.

Because of this, Cai Yong used mathematics to test Zhang Liao, in his mind, Zhang Liao was only in his twenties, and when he went out to practice martial arts, read books and practice calligraphy, how could he have time to study mathematics.

Zhang Liao saw Cai Yong pick up a bag of calculation chips, put on a posture, and gave him another bag, he smiled, put the calculation chips in his hand into the cloth bag, in Cai Yong's stunned expression, a little shyly said: "Uncle, in the next Bucai, I created a number and a rule as a calculation, which is a hundred times better than this calculation." ”

"Self-created? Better than a hundredfold? ”

Cai Yong looked at Zhang Liao in amazement, then frowned, and there was a little more displeasure in his eyes, this kid who was only in his twenties dared to say that he created his own numbers and rules?

He flicked his sleeves and said with a calm face: "Young people don't want to be ambitious, this calculation and algorithm are deduced by countless ancestors, how can they be easily disdainful!" ”

Zhang Liao smiled and said, "Uncle, why don't you listen to the kid and make a conclusion." ”

Cai Yong is a person with elegance after all, and he resisted the idea of driving people directly, and snorted: "In this way, the old man will learn some of your so-called self-created numbers and rules." ”

Zhang Liao looked at Cai Wan on the side: "Ah Fu, go get some charcoal." ”

"Charcoal?" Cai Wan was stunned: "What kind of pen is that?" ”

Zhang Liao said: "Take some unburned thin sticks of wood from under the stove." ”

Although Cai Wan was puzzled, he still did what Zhang Liao said.

Cai Yong was silent with a black face here, his impression of Zhang Liao at this time turned bad and disgusted, he only felt that this young man was too arrogant and reckless, and he was even more shameless, this time his daughter was afraid that he was wrong.

He glanced at his daughter, but saw that his daughter was still looking at the kid with a smile, her eyes were full of tenderness, and her old face was even darker.

Not long after, Cai Wan took a few unburned wooden sticks, Zhang Liao chose one of them, and wrote ten numbers on a white piece of paper in front of him with the charred black charcoal at the top, which was the Arabic numerals, but it was shamelessly said by this guy that it was self-created.

Zhang Liao scratched on the paper and said, "This is one, this is two...... It's nine, it's zero......"

Cai Yong frowned and looked at the nine strange symbols written by Zhang Liao, until the last zero, he was stunned: "What is zero?" ”

Zhang Liao then remembered that the number zero appeared the latest, and it was applied the latest, because this number would break the rules and invalidate many algorithms, but this number was extremely important and could fill all the gaps.

"Zero, nothing, such as ten, hundred, thousand, is counted in the last position and expressed by vacancy, while the number can be replaced by zero." Zhang Liao explained as he wrote.

With his explanation, Cai Yong's expression became more and more shocked, it was because he was proficient in mathematics, so as soon as he heard Zhang Liao's explanation, he immediately understood the importance of this number, which was almost a milestone in the effect of mathematics!

Cai Yong looked at the young man in front of him in shock, and there was no longer the disgust and disdain of Fang Cai, but the horror from the heart, not to mention the number symbol created by this young man, the appearance of this zero alone is enough to prove his talent in mathematics!

He stretched out his slightly thin hand, trembling and stroking the small circle on the paper, and looked up at Zhang Liao: "Is this zero really your own creation?" ”

"Exactly." Zhang Liao, a shameless guy, had an indifferent look of acceptance, anyway, the person who created this number would still be born for many years.

Cai Yong took a deep breath, and suddenly had a little more expectation for these symbols created by Zhang Liao, as well as the rules he just mentioned.

Zhang Liao casually drew out a few two-digit numbers, three-digit numbers, and explained: "These number combinations, because of their different locations, so the values represented are also different, the right position is one, the left is ten, and then the left is hundred, so these three numbers are one hundred and eleven, which is much simpler and clearer than the calculation, and it is extremely convenient if it is used for bookkeeping." ”

Cai Yong looked at the combination of numbers and thought about it repeatedly, because the decimal system had been adopted at this time, so he quickly understood what Zhang Liao said, but suddenly looked up at Zhang Liao again: "Then how to calculate?" ”

The biggest role of the calculation chip is to carry out the four operations by placing wooden sticks, if Zhang Liao these numbers can not be calculated, even if it is simple, it is not of much significance, and can only be used for recording.

Zhang Liao smiled: "Uncle said that if he wants to count anything, the kid will demonstrate it." ”

Cai Yong had forgotten to suppress Zhang Liao at this time, but was immersed in excitement and anticipation, and immediately said a few calculations in a row, and Zhang Liao easily used the vertical calculation to calculate the results, Cai Yong didn't even need to calculate, he knew that these results were correct, he was even more shocked in his heart, and he was busy asking Zhang Liao about the mystery.

In fact, vertical calculation is mainly based on a multiplicative distribution law, as long as you understand this, it can be easily understood, even if Zhang Liaodang wants to explain it to Cai Yong.

But at this moment, a clear voice suddenly came from outside the door of Cai's mansion: "Sister Cai, Dong Huang is visiting." ”

Hearing this voice, Cai Yong's face suddenly became difficult to look at, and Cai Yong also frowned, revealing a look of disgust.

"This big fly is here again, it's so hateful." Xiao Cai Ying also pursed her mouth.

Cai Yan saw Zhang Liao frowning, and subconsciously explained: "Although I don't want to excuse myself, this Dong Huang comes to the mansion from time to time to disturb, his identity is not ordinary, and Ah Weng has no choice." ”

Zhang Liao squinted his eyes and nodded: "I'll deal with it." ”

"Oh?" Cai Yong looked at Zhang Liao in disbelief: "Can you retreat this person?" ”