Datang New Giants

Chapter 42 Cross the river and demolish the bridge
"Miss Xiaozhi, are you okay?" Hong Ling asked with some worry.

Wasn't it good just now? No matter how you drew a few lines, you stopped moving, your eyes widened and your mouth opened, with a surprised look on your face. Didn't the lady bewitched?
Zheng Yanzhi regained her senses, shook her head, and while looking at the numbers on the paper, she said: "It's okay, I just think about something that is clearly calculated, Hong Ling, stand back, and don't ask you not to speak."

Hong Ling flattened her mouth and said in a low voice, "Understood, Miss Xiaozhi."

Miss is like this, she is usually fine, but once she learns, she seems to be a different person, just now she blamed herself for interrupting her study.

Zheng Yanzhi thought for a while, then said to Lu Ting respectfully: "Young master Lu is really talented, you can think of such ingenious problem-solving skills, I admire you, I see some mystery in this question, and there are still some things I don't understand, I also ask Mr. Lu to clear up the confusion."

As soon as an expert makes a move, he will know if there is one. Although it is not from one to ten thousand, the reason is the same. Lu Ting only writes one to one hundred. It is also for the convenience of his own understanding. Zheng Yanzhi put away her doubts and has a correct attitude stand up.

No matter how unhappy he is, Lu Ting still has real talents and real learning. For those who have real talents and real learning, it is normal to lower their figure a bit.

This question is very convenient to calculate using the arithmetic difference principle. Lu Ting briefly explained it, and then listed the formula, that is, add the first number and the last number, and then multiply the quotient of the last number divided by two, the answer it came out.

While listing the formula, Lu Ting explained: "Ms. Xiaozhi is optimistic. This is the calculation method from one to one hundred, and this method is also used to calculate from one to ten thousand. One thing to pay attention to is that there must be regular numbers to do this. Calculation, for example, numbers without scale like one, eight, eleven, and 23, this kind of skill can’t be used, and it has to be calculated honestly.”

"Understood." Zheng Yanzhi nodded again and again: "There are rules that can be applied. Those who have no rules can only be counted one by one. It's a pity that such a good method cannot be used universally."

Zheng Yanzhi was really convinced now. To be honest, when I first heard it, I felt that Lu Ting was talking nonsense, but I didn't expect Lu Ting to turn the nonsense into reality again. According to his calculation method, the addition from one to ten thousand can really be calculated in a few breaths. Not to mention adding to ten thousand, it is not difficult to add one hundred thousand, one million, ten million, ten million, such a simple law, why didn't I discover it?

I really want to see what the mind of this prodigal son is like, with so many wonderful ideas.

"There is no pure gold, no one is perfect, and there is no omnipotent problem-solving skill." Lu Ting said with a smile.

Finished the task, call it a day, now I can't deal with Wu Lin and that bastard beard, but I'm still very confident in dealing with a pretty little maid.

Zheng Yanzhi thought for a while, then suddenly frowned and said: "Master Lu's method is indeed wonderful, but it also has shortcomings."

"Shortcomings? Miss Xiaozhi has any doubts, just ask them." Lu Ting said generously.

This little maidservant is not crossing rivers and tearing down bridges, intentionally picking on thorns, if she learns the skills, she will turn her face.

Zheng Yanzhi did not notice Lu Ting's expression, but picked up the pen, added one hundred and one after one hundred, put down the pen and said with some doubts: "Mr. From one to one hundred, add one hundred and one after finding the sum, or is there a way to directly use the young master's formula to complete it?"

"Remainder? Miss Xiaozhi, hasn't learned decimals?"

"Decimals?" Zheng Yanzhi froze for a moment, then said with some hesitation: "The decimals you mentioned, are zhang, chi, inch, centimeter, millisecond, or micro?"

Lu Ting patted himself on the head, said with a wry smile, "I'm confused, Xiao Shu is unfamiliar to Miss Xiaozhi, it's normal not to understand."

There is no concept of decimals in ancient times, but there are fractions in the Nine Chapters of Arithmetic. The first person to express this concept in words was Liu Hui in the Wei and Jin Dynasties. In the process of calculating pi, he used chi, inch, cent, centimeter , millisecond, second, suddenly, etc. 7 units; for smaller units below suddenly, they are no longer named, but are collectively referred to as "micro numbers". Decimals", it will take hundreds of years for the real decimals to appear and be standardized.

Zheng Yanzhi's eyes lit up, and she immediately went to the side coffee table and poured a cup of tea, and put it lightly in front of Lu Ting: "Young master Lu, your mouth is dry, please use tea, decimals are unfamiliar to my family, I have been taught by Mr Lu , it’s no stranger.”

decimal?Have a new trick?After Lu Ting simplified the numbers last time, Zheng Yanzhi felt better the more she used them. Now she heard Lu Ting talk about the "decimal numbers" that she had never heard of before, and she became more energetic on the spot.

Not only did he feel refreshed, but he also had troubles, so he took the initiative to pour tea for Lu Ting.

Several servants who looked at the garden from a distance were stunned when they saw it. What's going on?Ms. Zheng brought Lu Ting to the back garden, which was already surprising, and now she pours tea for him herself?Oh my God, the eldest lady of the Zheng family in Xingyang poured tea for a little-known, even somewhat bad-named Mr. Lu in Suzhou?

Are you dazzled?A maid even wiped her eyes, for fear that what she saw just now was a hallucination.

Fuzhi raised his head slightly, his eyes were full of pride, the young master is the young master, Miss Xiaozhi is Mrs. Lin's confidant, she was very tempered just now, her eyes were almost staring at the sky, and she was submissive with only a little effort , The tea should be poured and the tea should be poured.

Hong Ling on the side covered her face with one hand helplessly, not knowing what to say.

The young lady was too reserved, she said she would not see her, and she broke her promise in a blink of an eye and became fat; before she came, she said she would show off to Mr. Lu, and waited for him to taste the taste of begging for help, but she took the initiative to keep someone; she threatened to ask Mr. Lu to clean up the silt in the lotus pond and come out In one breath, now I have become a maid pouring water.

It's the opposite of what you imagined.

Hey, the little maidservant has a strong thirst for knowledge, so she took the initiative to pour the tea. Lu Ting felt happy, took the teacup bluntly, and said casually: "It's a pity that I didn't taste the sweet-scented osmanthus cake made by Miss Xiaozhi. .”

A pair of pink fists were clenched in his sleeves. This prodigal son was not only picky, but also very good at pushing his feet. He was a little upset, but he didn't show it on his face. He said with a smile: "Today is too late to do it. Finish it tomorrow and send someone to the Young Master's residence."

Hong Ling covered her face with her hands, speechless.

Lu Ting nodded in satisfaction, wrote a "1" on the paper, and began to explain: "Decimals are actually very simple, that is, to divide the smallest value into smaller parts. A cup of tea is similar, but decimals are more stable."

So Lu Ting explained the principle of decimals from the shallower to the deeper, and under Zheng Yanzhi's repeated requests, he used decimals to solve the calculation of odd numbers in arithmetic equations. This also involves the multiplication and division of decimal points. Fortunately, it is not some advanced theory. Xiaoqiao's talent in calculating is also astonishing, and within half an hour, Xiaoqiao's maid has integrated it.

After talking for so long, his mouth was dry. Lu Ting picked up the teacup and drank the cold tea in one gulp. Then he breathed a sigh of relief: "Miss Xiaozhi, there is no problem now."

While speaking, Lu Ting put the empty tea cup forward a little bit.

The meaning is obvious, the teacups are empty, let's refill the tea.

Zheng Yanzhi, who was very clever just now, didn't seem to see the empty cup, and said with a smile: "Young Master Lu is really talented, I admire him, if I have time, I really want to learn more from Young Master Lu, but it's a pity that my master left a lot of things to do , I'm really sorry for delaying Mr. Lu for so long, and I don't dare to keep Mr. Lu, Hong Ling, send Mr. Lu out, by the way, let someone prepare the car, the road is so far, it's too tiring to walk. "

Hong Ling responded, walked up to Lu Ting with a smile and made a gesture of invitation: "Mr. Lu, this way please."

Is this a rush?

Lu Ting was stunned. This little maidservant changed her face too quickly. She was still respectful just now, and she was just about to perform the gift of a disciple. As soon as she finished explaining to her, she drank half a cup of cold tea and served it all. Save the trouble of seeing off guests with tea, and just open your mouth to send yourself out?
It is said to be sent, but it is actually rushed.

Solving the arithmetic difference formula earlier is regarded as a transaction, and explaining decimals later is regarded as piao. Lu Ting is a little bit annoyed. I didn't expect to cross the river and tear down the bridge as soon as I achieved my goal. Needless to say, I must have accumulated a lot of resentment in my heart.

On weekdays, he would leave as soon as he left, but Lu Ting can't leave at this time, there is no problem in passing, but the travel expenses have not been settled yet.

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(End of this chapter)