After Luo Hongyi heard this, she thought about it, should she also pay attention after getting married. Well, you can't be too strict with Lu Yu, you should give him more pocket money, so that he can have money to buy clothes for himself, and let him save some private money by himself, so that when he saves more, he can take it all at once, so that he will have a large sum of money at once. Thinking of this, Luo Hongyi nodded heavily. At this time, Lu Yuyi, who was listening to the peacekeeping arrangements in the Great Hall, shuddered and looked at the ceiling, whether the air conditioner was turned on too much.

Qi Binxuan continued to tell the story.

Seeing that there was no money to buy a sword, Dad sighed and said that it seemed that he could only wait a few months and save enough pocket money to buy a sword. At this time, the son came over, and this son was very filial. He told his father that he still had New Year's money, and he used it to buy a sword for his father. Dad said no, let the son use the New Year's money himself.

The son saw that his father insisted on not wanting to, so he secretly went to the armory store the next day to buy a sword for his father. When the son arrived at the armory shop, he saw a lot of weapons, such as knives, spears, swords, halberds, axes, axes, axes, hooks, forks, whips, maces, hammers, sticks, lances, sticks, crutches, and meteor hammers. But the son looked at the novelty and didn't know what it was called.

The son asked the boss if there was anyone who sold swords. The boss said, of course, what kind of sword do you want? My son doesn't understand, so he says how much is the most expensive. The boss said that the most expensive is the treasure of the town store, five hundred, but look at you so young, cheaper, two hundred and five, but if it is cheap, you can't return it. The son said that if there was no problem, he would not retreat. So the boss took the treasure of their town shop and gave it to his son.

When he got home, his son gave his father the treasure of the town store. Dad was very pleasantly surprised at the time, although he didn't let his son buy it for him with New Year's money, but his son was still very happy to buy it. But as soon as I opened the box, I saw that there was an iron weapon inside, like an iron rod more than one meter long, but the cross-section of the stick was square, and there was a groove that ran through a circle horizontally every ten centimeters.

Dad looked at the weapon and didn't look like a sword, so he asked his son, why is this shape? The son said that this is the treasure of the town store of the weapon spectrum, which was originally five hundred, and it was bought at a discount of two hundred and five, as for the shape, it is a little strange, of course, there are no characteristics that can be called the treasure of the town store?

Dad listened to the reason, so he took the treasure of the town store to the square in the evening to practice Tai Chi sword with the uncles and aunts. The aunts and uncles didn't say anything when they saw that their father finally stopped taking the branches. But after practicing for a while, it was a little strange to see Dad's weapon. Everyone came forward to take a look, and my father boasted that this was the treasure of the town store, and my son was filial to buy it for me.

The uncles and aunts all praised their sons for their filial piety, but they weighed it, good guy, this thing is heavy, it is estimated to cost five or six catties. So he quipped, Dad, you are going to learn from the lonely and defeated, and practice peerless martial arts with a heavy sword. Dad smiled and said where, just exercising, practicing and playing.

However, there is an advantage to having more people, and there are people who are well-informed. One person recognized it and said that this was not a sword, but it looked like a sword. The crowd asked what a gong was. The man explained that the mace was a kind of short weapon in ancient times, which belonged to the whip class. About four feet long, generally four-edged, slightly smaller at the upper end, and stalked at the lower end. The mace is composed of a mace and a wedge. There are two types of copper handles: cylindrical and sword-shaped. The body of the mace is a square quadrangular shape, the thickness of the mace is about two inches, and then it is thick, and the thinner it is to its end, and it gradually takes on a square cone. There is a steel gauntlet at the junction between the handle and the body. The body has edges and no blades, the edges and corners are prominent, and there are knots at every distance of six or seven inches. The tip of the body is sharp and can be used for stabbing. There is a swallow at the end of the handle, like a diamond.

After everyone listened to this explanation, they compared it and saw that this weapon really looked like a mace.

The man also said that the generals used this gong a lot, Qin Qiong, the general of the early Tang Dynasty, Qin Shubao was good at making double gongs, Hu Yanzhuo, a good man in Liangshan, was also good at double gongs, and Niu Gao, the general of the Yuejia army, was also good at making double gongs. The man said that it would be good if you learned this, but it would be a bit nondescript to practice Tai Chi Sword with this.

The father was depressed for a while, so the next day he and his son went to the armory shop to find the boss. The boss listened to it and said that this was a sword, and it was not wrong.

The three of them tossed for a long time, and finally figured it out. This "sword" is the fourth tone, and this "mace" is the third sound. As for the son, he is from the Daimyo Mansion and has an accent, and the fourth tone is easy to say the third tone. For example, confusion (mixed, the pronunciation is hun4, the son often says hun3), temporarily (temporary, the pronunciation is zan4, the son often says zhan3), and a while (will, the pronunciation is hui4, the son often says hui3). No, the son went to buy a sword, but it turned out to be the third sound, and the boss gave him a hammer.

The misunderstanding was explained, and Dad wanted to exchange the goods. The boss disagreed, first of all, when he bought it, he had already discounted it, it was so cheap, and he said that there was no problem with it, and he would not return or change it. The boss asked if there was something wrong with this? Isn't this nonsense, this iron product is like a big thick steel rod, and it can't be deformed if you fall.

The owner continued, "Second, this is the first item to be sold yesterday. We generally have superstitions when doing business, and this first item of sale is generally not returned, and it is auspicious. ”

Dad said, "I can't use this if I buy it, you say that I practice Tai Chi sword, why do you want a gong? ”

The boss said: "This is easy to do, you see I still have a 'score', which is dedicated to teaching people to learn the method, ten yuan, you take it, just for learning." It's not that you, you see that you are young, learning from old men and old ladies to practice Tai Chi sword, this is not in line with your age. ”

Dad thought about it, and it seemed that there was some truth in his life, didn't this person just want to be distinctive, and if he was like others, how could he still live his own wonderful life? So he took out the pocket money he had saved to buy a box of cigarettes and bought this "notebook."

When the boss saw that his father had bought a "score", he said with a smile, "This guest officer, the first half of this book is a single score, and the second half is a double-tone book, do you think you need to buy another one?" As long as it is two hundred and five, there will be no store in this village, and it will not be at this price in the future.

When the father heard this, he was anxious, and hurriedly pulled his son out, saying as he walked: "Come on, you can keep the two hundred and five for yourself." I'm going to have to wait until I'm done with the single trick. ”

So, there was such a scene in the square, next to a group of uncles and aunts practicing Tai Chi sword, there was a middle-aged uncle, holding a boxy long weapon dancing there, tiger and tiger. If you see it at any time, don't be surprised, don't smile and point, you know, this weapon contains a son's deep love for his father.

Qi Binxuan said to Feng Hao when he said this: "The story is finished, do you understand?"

Feng Hao pursed his lips and said, "I can irresponsibly tell you that this story is really boring." ”

Qi Bin Xuan was unhappy: "Don't you understand the gist of this story?"

Feng Hao said unconvinced: "What is the main purpose? Is it to guide children to be filial to their elders?"

Qi Binxuan sighed, pretended to touch Feng Hao's head and said, "Hey, rotten wood can't be carved, dung walls can't be encircled, summer insects can't speak to ice, and well frogs can't talk to the sea." It's hard for your parents to pull you so big. It's definitely a lot of wasted effort. ”

Luo Hongyi couldn't stand it anymore, and said: "What do you want to tell this story, you should tell it quickly, don't hang people's appetites." ”

Qi Bin looked at Luo Hongyi with a smile, and as soon as he said that Feng Hao's rotten wood could not be carved, this Luo Hongyi went up. But seeing that Luo Hongyi was going to be furious, he quickly explained: "This story is just to make you remember a sentence." 'Fake sword, square sword. Why remember that, because that's the recipe for the squared difference formula. You see, the formula for the square difference is (a+b)(a-b)=a²-b². A and B represent numbers, as long as you pay attention to the correspondence between the positions before and after, you can omit them. Next, look at the others, you see the parentheses in front of the equal sign multiplied by the parentheses, you can briefly remember as the plus sign multiplied by the minus sign, the multiplication sign can be omitted, it becomes 'addition and subtraction'; You see, it adds up to 'addition and subtraction, square subtraction'. Then in order to make it easier for you to remember, I applied some means of memory methods, made up a story, made a homonym, no, the mantra became 'fake sword, square sword'. How's that, do you understand?"

Feng Hao asked, "But what's the use of this? Memorize a formula, I'll memorize it a few more times and I'll be familiar with it." ”

Qi Binxuan explained: "There are several benefits to this. The first point is that you can master it faster than others. You grasp a knowledge point more than ten minutes and half an hour faster than others, how many knowledge points do you have in the seventh grade, do you think how many minutes can you save compared to others?"

"But can every knowledge point be memorized like this?"

"It depends on your teacher's level. Qi Binxuan replied: "So a good teacher is very important, which is why parents are trying their best to let their children go to a good school." The second point is that the formula I mentioned is concise. Look at how you memorize it. It is to omit the parentheses and simply memorize it as 'a plus b multiplied by a minus b equals a square minus b square', seventeen words. My mantra, five words. Because it's easy and fast, you can save time when you take the exam and do the questions. The third point, this mantra directly refers to the feature point, the equal sign is mainly the plus sign multiplied by the minus sign, and the equal sign is mainly the square sum minus. In this way, as long as you master these characteristics, it will be much easier to do the questions. Let's take the previous question. 2009×2007-2008², you look at this 'feature point', there are squares and minus signs, and immediately you think of the 'square sword', and then see if you can make up the square difference formula. It's easy to decide what to use, 2009 and 2007 make up 2008, and this becomes a variant of the squared difference formula. Isn't it easy? If you don't believe it, test it out with this exercise and see if it's easy. ”

So the three of them went through the exercises in this chapter together, and the result was that the exercises that usually take the little boy half an hour to complete were completed in five minutes.