"Si Ren, have you answered it?"

"Wait a little longer, it's soon, it's soon."

"Zongyuan, don't urge me, after all, 999 times 999 are not a small number."

...

On the ground, a young scholar was fiddling with his calculations, sweating all over his head.

The other three were watching him performing there.

Then, through his expression, the old man could feel that the other party was easily mastered.

This made the old man feel curious.

The old man also quietly walked over from the side without affecting the four people and watched from behind.

...

"The answer is out!"

"The final answer is 997,01."

Then everyone looked at the scholar who looked easy to master.

I think I want to know if the former is correct.

The scholar named Zongyuan also sighed happily.

Reply:

"Forget it for so long, the answer was still wrong."

"Is my answer wrong?"

The young scholar who should be called Siren was also dissatisfied with the truth.

Liu Zongyuan said: "The correct answer is 998,01."

"Impossible, absolutely impossible!"

"And you have to calculate this question for at least a short time, and I didn't even breathe, and the answer came out."

Shuang Siren looked at his calculations, but still didn't feel that he had made some mistakes.

Seeing that Shuang Siren was still unwilling to accept, Liu Zongyuan also said, "Come on! Let you see how to calculate these large numbers cleverly."

"Nine hundred and ninety-nine can be regarded as one thousand minus one, nine hundred and ninety-nine times nine hundred and ninety-nine means one thousand minus one thousand minus one."

"Here, you need to use each number here to multiply the opposite number."

"But multiplication of each number is very simple, even mental arithmetic can easily get the answer."

"One thousand velocity one thousand, one million, one thousand velocity one, one thousand, one thousand velocity one, one thousand, one thousand, one velocity one, one."

"Finally, add these four numbers together."

In fact, Liu Zongyuan doesn’t understand this principle very well.

So when someone asks.

“Why is it subtraction here?”

Liu Zongyuan could only reply: "Because if you remove the brackets and remove the brackets, it will be reduced here."

"It's like how to say it."

"Nine hundred and ninety-nine times one is equal to one thousand minus one, multiply one by one. Each number in brackets here is multiplied by one, and the latter one is also subtracted. And the answer is also nine hundred and ninety-nine."

...

The old man has also studied mathematics.

However, some of the symbols, such as the brackets and a horizontal line, don't really understand what it means.

As for the elderly man looking at him curiously, the four of them didn't care.

But let Liu Zongyuan talk about it again, what is the reason here?

However, Liu Zongyuan was just a two-knives, and it was also two-knives taught by Su Yinger's second brother. He really asked him to explain the principle of the law of multiplication of brackets. He could explain it clearly, but he only knew that this is how it was calculated.

Anyway, Su Ying'er's second brother also said, you just need to remember that this is the calculation.

The old man, while listening to Liu Zongyuan's explanation to the three of them, and the more he explained, he also looked at Liu Zongyuan's formula.

He followed Liu Zongyuan's previous thoughts and started to meditate.

He actually doesn't understand any brackets.

I don't even recognize the minus sign.

However, through Liu Zongyuan's second explanation, it can be reversed.

He vaguely felt that these four numbers, namely two thousand, and there was a vaguely strong connection between two thousand.

Then, through some previous words from Liu Zongyuan, he conducted extensive quotations and tried to figure out the solutions of people who carried this method.

It is easy to understand to turn nine hundred and ninety-nine into one thousand and subtract one, and then distribute it.

But when two ninety-nines are converted into one thousand and one, how should they calculate it afterwards, many people are prone to dazed.

And the old man couldn't find the trick at the beginning.

But after all, they are also knowledgeable people. To understand the principle here, you only need to reduce one of them by one thousand and be regarded as a whole first.

Convert it into one thousand minus one multiplied one thousand, add one thousand minus one multiplied by (subtract one). This (subtract one) is very important. Just use two parts and then simplify it.

But even with such a simple truth, the old man couldn't help but spend a lot of effort to understand.

And, I only understand most of them,

Because according to the habits of people of this era, what appears in their minds is not a simple and beautiful formula.

In their minds, there is only a sentence in which you can easily forget the text of the first half after reading the second half.

Especially for the elderly, it is even more difficult.

Because he came late and had no knowledge of symbols at all, he could only store all the words in his mind, and spent at least 560 bits of short-term memory brain capacity to store these words. In the end, he had to think about the practical significance of subtraction, multiplying, decreasing, how much is the same as subtraction. In this world, there is something like I owe you a copper coin, multiplying by I owe you another copper coin? This matter seems contrary to common sense.

However, this is the most famous issue of "the result of two debts multiplied by magical income" that still plagued people even in the eighteenth and nineteenth centuries.

However, although the old man was indeed unable to solve this even philosophical problem in a short period of time, he knew that what he had calculated before should be wrong.

Then……

After thinking hard for a long time and still not being able to get the answer, the next step is to ask for advice. The old man bowed slowly to the four people, and the four people also bowed respectfully. The old man then had the opportunity to ask:

"I wonder if my friend can tell me if I can subtract one, multiply one, why the answer is..."

This place consumed a lot of his brain capacity, and Fang asked, "Is it a plus."

Liu Zongyuan was wearing a commoner. Seeing that the old man was asking him, he also came out to bow again. He replied humbly and respectfully: "Go back to the old man, in fact, I have just learned this method from others and have never learned the fundamentals."

"The person who taught me only told me that subtraction one multiplying one and subtraction one is equal to one, don't ask why."

The old man whispered in confusion: "Why is this?" Then he raised his voice a little more, "I don't know who the person who taught you is and where he is at this time, and I don't know if I can recommend it on my behalf."
Chapter completed!