"King, why do you have to keep the decimal point? Just like when we go to settle accounts, do we have to count every copper coin? ”

"Why is there such a number as a negative number? Is there any use and necessity for him? ”

"King, I already understand the one-dimensional equation, but this two-dimensional equation is really a little incomprehensible, can you tell me about it?"

……

After returning from Zhuangzi outside the city, Fang Fengzhu suddenly burst out with a passion for mathematics as if a switch had been turned on all of a sudden.

In fact, in the previous days, she had been studying hard, but every day she only took half an hour to read books and do problems, but after returning from the farm, the young princess suddenly tripled the time spent on mathematics, and at least two hours a day was quietly reading, or asking her husband for advice.

The reasons for this are also very clear and more understanding.

No matter who has been to the carpentry workshop of Han Wangfu and saw that the carpenters could double, triple, or even more the output of the overturned car by simply changing the content of their work and carrying out a simple division of labor, I am afraid they will be as surprised as Fang Fengzhu!

After the surprise, there is shock.

Because she figured out why every part of the overturned car must be made in strict accordance with the size, so that the parts made by each person can be perfectly assembled into any overturned car; At the same time, because of the wind, I understood how Wang Pu divided the labor among these carpenters, and how to determine how many people should be used to make different parts......

Precise statistics and calculations are the premise and foundation of everything.

So after returning from the farm, Fang Fengzhu became interested in mathematics like never before, and Li Yuanjia was also the first person to feel her enthusiasm.

Of course, no one else is qualified to feel it.

After all, it was the princess of the Han Palace, if she didn't ask her husband if she had a problem, could she still go to Wang Pu and Ma Liang? As for his wife's performance, Li Yuanjia naturally likes to see it, and patiently explains to her every day the mathematical foundation from more than a thousand years later......

"Alright, that's it!"

After telling Fang Fengzhu about a binary equation on this day, Li Yuanjia forcibly closed the book in her hand, shook her head and smiled: "Fengzhu, you have learned enough today." And it's not getting early, so it's time for us to go to dinner. “

“…… All right. ”

Licking her rosy lips, Fang Fengzhu nodded a little reluctantly.

And after seeing her expression, Li Yuanjia was also happy, and patted Fang Fengzhu's little hand a few times. He can understand this feeling very well, after all, he was a scholar in his previous life, and he can experience the happiness of learning things, and the satisfaction after overcoming a difficulty.

For Fang Fengzhu, the binary equation is indeed a little more difficult.

So after patting his wife's little hand, Li Yuanjia smiled patiently: "Don't be too anxious, your arithmetic foundation is very good, and you are smart, as long as you spend some time, it will definitely be fine!" ”

If Fang Fengzhu was twenty-six years old this year, he would definitely not waste so much of his time.

It's not that you can't learn new knowledge at the age of 26, but relatively speaking, 26-year-old people not only have a lot of poor thinking flexibility, but more importantly, they often have a lot of burdens on their bodies...... For example, men in this era often have to support their families, or have endless official duties; Women are also small enough to control a family, and large enough to control a family's inner house, where will they have the heart to learn new things?

But sixteen-year-old Fang Fengzhu has the best conditions.

Being young means receptive and flexible; And she just married into the Han Palace, and she didn't have too much "work" to take over at this time, so she had enough time every day......

"By the way, my lord, has my bereaved love come to you these two days?"

When the two walked slowly towards the restaurant, Fang Fengzhu suddenly remembered something and hurriedly asked in a low voice.

"Bereavement? No, I don't. ”

Stunned for a moment, Li Yuanjia shook his head with a smile.

Hearing him say that his brother didn't come, Fang Fengzhu suddenly breathed a sigh of relief, blinked his eyes and said: "It's best if he didn't come, if you dare to come and ask you for cards again, the king just ignore him!" ”

For his baby brother, Fang Fengzhu was also helpless.

The cards that Li Yuanjia promised him earlier had already been given, but in a blink of an eye, they were divided up by Fang's beloved fox friends and dog friends. However, playing cards in Chang'an City is becoming more and more popular, and as long as they have seen or played the cards produced by Han Wangfu, no one will want to continue to use their homemade inferior goods......

So after the cards in his hand were divided, Fang Yiai came to pester his sister again.

Her younger brother, of course, Fang Fengzhu will not be too angry, but what she is afraid of is that Fang Yiai does not know the severity, and she really bothers her husband again! Now when I heard Li Yuanjia's words, I was relieved.

However, as soon as Fang Fengzhu breathed a sigh of relief, Li Yuanjia lost with a smile: "Haha, my own brother, where can I ignore it?" It just so happened that Wang Pu and the others made some more cards and sent them to Dongshi, and I also asked someone to send a letter to the beloved and asked his friend to buy it at Xinhua Bookstore......"

……

"Bereaved virtuous brother, is this the family?"

Looking up at the four big characters of "Xinhua Bookstore", a teenager frowned and said disdainfully: "Xinhua Bookstore? What kind of quirky name is this? ”

"Haha, I guess it's a mess, right?"

"Does it matter if it's a weird name? As long as there are cards to sell, wouldn't it be good? ”

"Ouch, look, why is this bookstore so empty? I didn't even see a bookshelf, is it really a bookstore? Deceptive, right? ”

……

The seven or eight teenagers standing at the door chattered, making Fang Jun's face black again and again. Carefully glanced at Xiao Si and the shopkeeper in the bookstore, and hurriedly shouted in a low voice: "Shut up!" Shut up! I'm telling you, there's cards for sale here, and they're exactly the same as mine, and I don't want to leave! ”

After saying that, ignoring these guys, Fang Yiai walked into the bookstore first.

"Ladies and gentlemen, welcome to Xinhua Bookstore!"

After the second generation of officials came in, the guy hurriedly stepped forward and saluted respectfully.

Afraid that his friends would talk nonsense, Fang Yiai hurriedly asked; "I ask you, are there any cards sold in the store?"

"Yes, it just arrived yesterday!"

"Great, take it out and have a look!"

Under the continuous urging of the group, the guy hurriedly took two cards from the shelves and put them on the hands of Fang Yiai.

After seeing these two decks of cards, the teenagers were stunned.

"Tsk, this cardboard box alone is worth our trip!"

Seeing Wang Pu's specially designed exquisite cardboard box, they didn't need to open it at all, and the teenagers knew that they had found the right place. One of them immediately waved his hand and said loudly, "Get me twenty pairs and wrap them up." ”

"I want twenty too!"

"Twenty is a bit less...... I want forty pairs! ”

……

"Ladies and gentlemen, please wait!"

After listening to the miscellaneous voices, the shopkeeper next to him also hurried over, and said again and again: "I'm sorry, I'm sorry, there are not many cards in stock in our store, only fifty pairs for the time being!" In addition, these cards cost ten dollars for a pair of cards, so you have to think about it before you buy it! ”

"What? Ten runs? You're robbing money! ”