Rebirth of Wu Ba Spring and Autumn

After half an hour, Yan Ying, Jizha, Sun Ping, and Kong Qiu couldn't solve Qingji's math problem.

Seeing that the sky was getting late and the sun was setting, Qingji finally shook his head and gave the correct answer.

"The final answer is 657 pears and 343 fruits. The price of pears is 803 yuan, while the price of fruits is 196 yuan."

"..."

Hearing this, Yan Ying and the other four were a little dazed, and all the young masters in the school were also at a loss.

Ji Zha asked curiously: "I don't know how Your Majesty came up with this answer?"

"Two and three sons, let's see."

Qing Ji chuckled, then picked up a piece of chalk and answered on the blackboard.

The formula for this math problem was densely written on the blackboard by Qingji.

It is worth mentioning that the blackboard and chalk are also the first creations of Qingji.

It is different from the modern blackboard and chalk, but the effect is the same.

At this moment, a series of formulas and words have been listed on the blackboard——

The price of each pear: 11÷9=12/9 (text).

Each price: 4÷7=4/7 (text).

Number of fruits:

(12/9×1000-999)÷(12/9-4/7)=343(个)
Number of pears:

1000-343=657(pieces)
Total price for pears:
12/9×657=803 (text)
The total price of fruit:

4/7×343=196 (text)
"There is another solution."

As soon as the words fell, Qingji began to write on the blackboard again with chalk, listing out a set of mathematical formulas.

Solution: Let the pear be X and the fruit be Y.

xy=1000
11/9X 4/7Y=999
Solution: X=657; Y=343
即梨是657个，钱是:657*11/9=803
果是343个，钱是:343*4/7=196
"..."

Everyone present was dumbfounded.

What symbol is this?
Ghost character?
好为人师的庆忌，见到众人都是一副不解的模样，旋即届时道：“这是一种数字，1、2、3、4、5、6、7、8、9、10，对应的是壹、贰、三、肆、伍、陆、柒、捌、久、拾。”

"It corresponds to one, two, three, four, five, six, seven, eight, nine, ten."

"Compared to the numbers in the past, this new type of number is more convenient and suitable for calculation."

As he spoke, Qingji also erased the mathematical formulas listed on the blackboard, and wrote the corresponding numbers on the blackboard again.

"It's addition, subtraction, multiplication, division, plus, minus, multiplication, division."

"One plus one equals two, and one plus two equals three."

"Three minus one equals two. Two multiplied by two equals four, and vice versa, four divided by two equals two..."

The Arabic numerals in the previous life, as well as addition, subtraction, multiplication and division, and even a simplified version of the nine-nine multiplication table, were taught to everyone one by one.

This ninety-nine multiplication table actually existed before.

In the famous allusion of "Ting Liao Seeking Talents", after Qi Henggong issued the order of seeking talents, he ordered people to light a torch in front of the palace, ready to receive talents from all over the world at any time.

However, after a whole year passed, no one came to apply for the job.

At this time, a person who claimed to be proficient in ninety-nine algorithms boldly visited Qi Henggong...

This is the predecessor of the multiplication formula - Jiujiuge.

The original Jiujiu song is from "Nine Nine Eighty-one" to "Twenty-two as Four", with a total of thirty-six sentences.

Because it started from "Nine Nine Eighty-one", it was named Nine Nine Songs.

During the Spring and Autumn Period and the Warring States Period, not only the decimal system was invented, but also the nine-nine table.

As the ancient countries of Western civilization, Greece and Babylon also invented multiplication tables, but they are more complicated than the nine-nine table. …

They calculate multiplication and division very hard, so people who can divide a large number will be regarded as experts in mathematics.

Until the beginning of the thirteenth century, the Eastern calculation method was introduced to Europe through the Arabs, and the Westerners discovered its convenience, so they learned this new method.

Therefore, Qingji also had to admire his ancestors.

At least in some fields, the ancestors of China are ahead of the world!

"My lord, what kind of symbol is this?"

Ji Zha pointed to a period on the blackboard and asked suspiciously.

"It's a period. And commas, exclamation points..."

Qingji is determined to change the status quo.

Because people in this era write, no matter whether they use bamboo slips or paper, they don't know how to divide symbols.

In the face of dense text, without punctuation marks, it is actually very painful.

Qingji often encounters this kind of problem when reviewing government affairs on weekdays.

Read slowly, one word at a time.

Read it again, and understand the meaning between the lines over and over again.

However, wouldn't it be painful to read it quickly and not have to read it in the future?
You must know that the output of ancient books is very low, and there are very few types of books that can be found on the market.

However, after Qingji invented papermaking, a large number of books, such as "Shangshu", "Book of Changes", and "Book of Songs" were copied and circulated in the market.

Qingji has to deal with some complicated government affairs every day, without punctuation marks, it is actually a very headache.

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After all, this is work for Qingji, not reading and enjoying life!

Like Confucius, Ji Zha and others, they often don't let go of the book, and they can read a book dozens of times, and they have read it thoroughly.

They enjoy this kind of reading time, so the punctuation is not very useful.

Rao is so, punctuation marks also have a role.

Sometimes one less punctuation mark, that is, a sentence sentence, may also misinterpret the meaning of a paragraph.

"Second and third sons, I will ask you another question."

Qingji looked at the half-understanders, then smiled, and wrote a math problem on the blackboard——

The number of chickens and rabbits in the same cage is unknown, and thirty-six heads are exposed in the cage.

Count fifty pairs of feet, how many chickens and rabbits are there?
This is the famous ancient arithmetic problem——

Chicken and rabbit in the same cage!

Compared with the math problem that Qingji asked before, it can be said to be much simpler.

Qing Ji deliberately promoted Arabic numerals, addition, subtraction, multiplication and division, and punctuation marks.

After a long time, everyone buried their heads and began to answer.

With the methods of addition, subtraction, multiplication and division and Arabic numerals taught by Qingji, everyone present can basically solve them quickly.

However, the question of time mainly depends on whose brain turns faster.

"Father! My son has answered it!"

With an excited expression on his face, Wu Heng came to Qingji with a paper full of formulas in his hand and said, "The final answer is fourteen rabbits and twenty-two chickens!"

"How did you answer it?"

Qingji was quite curious.

Wu Heng quickly replied: "If you follow the trick taught by the father, all the rabbits will 'hide' their two feet, that is, multiply thirty-six by two, and there will be seventy-two rabbits."

"Now there are one hundred feet, so hide twenty-eight, and divide twenty-eight by two, which means that there are fourteen rabbits."

"It's easier to get the number of chickens. Thirty-six minus fourteen, that is, there are twenty-two chickens!"

"good!"

Seeing Wu Heng who is so witty, Qingji nodded his head slightly to express his approval.

Seeing this, Wu Hong, who was standing not far away, could only silently take back the paper on which he had already calculated the correct answer.