Infrastructure: I survive in troubled times

Chapter 163 Arithmetic (three more)
"What else does Mrs. Hong have to say?" Cao Huaimin said impatiently.

Cao Huaimin's attitude made people frown.

Hong Lianshuo looked at him calmly and said nonchalantly, "It's about arithmetic."

"Study of arithmetic?" Cao Huaimin frowned slightly and looked at her, twirling his beard, "Any questions? Simple arithmetic can be taught. If it is more complicated, you have to understand it. But ordinary people only need to know the simple ones. Algorithms are fine, most people will never learn advanced algorithms in their lifetime.”

Hong Lianshuo burst into a big smile when he heard the words, talking to someone who knew how to do it was comfortable.

Cao Huaimin looked at her happy with puzzled eyes, "What are you laughing at?"

"I laughed and asked the right person." Hong Lianshuo looked at him with a bright smile and said.

Cao Huaimin was completely confused, "What do you mean?"

"How do you describe this hook, three strands, four strings, five?" Hong Lianshuo folded his forefinger and looked at him for a while.

"This theorem of Shang Gao." Cao Huaimin looked at her in surprise and said, "You still know this?"

The original Pythagorean theorem, the ancients called it the Shanggao theorem!Hong Lianshuo muttered in his heart.

"How is this expressed?" Hong Lianshuo asked, looking directly at him.

"The method of cutting the circle, in which the circle is divided into two parts, the cut circle is the back of the arc, the two ends of the back of the arc are called the string, the half of the arc and the string is called the arrow, and the inside of the arrow is equal to the two Pythagoreans. The semi-arc is the hook, the reduced vector is at the radius of the circle, the remainder is the strand, and the two ends of the Pythagorean strand are called the diameter corner. It is also called the chord, the chord of the Pythagorean strand, and the radius of the circle is also, the three moments of the Pythagorean chord are square, and The two sides of hook and share are as generous as strings." Cao Huaimin finished in cadence.

Don't say that Hong Lianshuo was dumbfounded, Chen Zhongyuan and the others were immediately dumbfounded, eyes full of mosquito coils.

"What are you reading? It's like a monk reciting the scriptures. We don't understand a word." Chen Zhongyuan said in a rough voice, "I can still understand this monk reading the scriptures."

Hearing this, Cao Huaimin glared at Chen Zhongyuan angrily, with a clear expression of disgust and vulgarity on his face.

Chen Zhongyuan said again carelessly, "I'm stupid, who of you understands the explanation and explanation."

With one sentence, Cao Huaimin was relieved, what did a rude person care about with him?
"The area representation of rectangles, squares, and triangles is so elegant, does it make people listen to heaven?" Hong Lianshuo raised his eyebrows and looked at Cao Huaimin.

"How can this be called a book from heaven? It's very clear! I think what I said is too simple." Cao Huaimin looked at her with a stubborn neck and said unconvinced.

"Come on, come on, is it easier to express this way?" Hong Lianshuo raised his eyes and looked at Mo Sanya and said, "Sanya give me a branch."

"Yes!" Mo Sanya cupped her hands, stretched out her hand and poked a branch, poked the top branch, and handed her bare hands to Hong Lianshuo.

Hong Lianshuo pointed the place where the branch was broken at himself, and handed the branch to Cao Huaimin, "Old Cao, can you draw these figures?"

"It's easy." Cao Huaimin took a branch and drew rectangles, squares and triangles on the ground.

"If you have a ruler, measure the length." Hong Lianshuo looked at him with bright eyes and said meaningfully, "How to calculate like this!"

When Cao Huaimin heard the words, he stood stiffly on the spot, and the branch in his hand fell with a click.

"What's wrong with Mr. Cao?" Lin Nanzheng rubbed his elbow on Han Chahu's arm.

Hong Lianshuo pointed at the figure on the ground with his index finger and said, "If the figures and figures are combined, is it easier to calculate the area than your long essays!"

When Cao Huaimin heard this, his eyes widened, and he almost fell out of the window, "I...I..."

"Don't get excited, don't get excited." Hong Lianshuo was really afraid that he would faint from the excitement.

"Just like the Pythagorean theorem that you talked about at length just now, you can directly say: the addition of the square of the hook and the square of the stock is the square of the string." Hong Lianshuo looked at him with his warm and jade-like eyes and said with a smile, "As you have said. The mathematics explained has really raised the threshold for people to learn and accept mathematics. The Pythagorean theorem is still like this, and there is no way to express more complex mathematical problems.”

"If you express math like this, you directly lower the threshold." Cao Huaimin finally found his voice and looked at her happily and said.

"Yes! To simplify arithmetic, can arithmetic have its own characters to be more accurate and simple, just like words. It is clear at a glance, and arithmetic is clear." Hong Lianshuo looked at Cao Huaimin with burning eyes and said.

"Writing?" Cao Huaimin looked at her and said with a frown.

"To be exact, numbers! What's the matter? Weights and measures can be unified, and mathematics can be unified into simple symbols. Nothing is impossible. If there is a will, things will come true." Hong Lianshuo looked at him calmly and said, "Simple numbers, graphics, and simplification. Arithmetic expression."

In ancient times, there were few scholars, and those who were able to learn something like math and math were rich families.

Just as the simple Pythagorean theorem is interpreted in classical Chinese, it is like listening to the scriptures, and it directly eliminates the thoughts of ordinary people.

"I have to think about this, think about it." Cao Huaimin looked at her with excitement and flushed.

"One, two, three, four...Ten, hundred, thousand, and ten thousand are very simple numbers." Hong Lianshuo raised his eyebrows and looked at him.

"Nine-Nine Tables, everyone can memorize it! You can also do simple addition and subtraction, so what will you do if you leave the abacus with two-digit and three-digit numbers?" Hong Lianshuo asked Cao Huaimin directly.

"Ah..." Cao Huaimin scratched his head and said, "This is very troublesome."

"How about listing it like this?" Hong Lianshuo took out a branch from his hand and listed it vertically on the ground, "Add the two numbers up and down, calculate and add."

"Uh... I will too." Chen Zhongyuan said happily, "Two and three, five. It's too simple."

"What about the two digits?" Cao Huaimin looked at her with burning eyes and said.

Hong Lianshuo listed the vertical form, then marked the ones and tens, and wrote down two two-digit numbers.

"I'll do it too, two and three, five, four and five, nine." Lin Nanzheng said simply and easily.

"In this way, you can do calculations anytime and anywhere without using abacus. Find a place to squat on the ground and then you can do whatever you want." Hong Lianshuo raised his eyebrows and looked at Cao Huaimin with glazed bead-like eyes.

"Decimal, round!" Cao Huaimin looked at her eagerly and said again.

Hong Lianshuo put down his son, squatted directly on the ground, and wrote six vertical styles in one breath, and the number was getting bigger and bigger, directly [-].

Carry is a better expression.

"How?" Hong Lianshuo looked at Cao Huaimin with a smile on his face and said.

"If this is promoted, it will be easy to learn arithmetic." Cao Huaimin said excitedly rubbing his hands.

(End of this chapter)