"At what cost?"

Di Wenchang said nonsense: "The price is that you must lose your own internal force, and use a secret method to convert the internal force into electrical energy, so that the mobile phone can continue to maintain." Pen, fun, pavilion www. biquge。 info”

"Do you want to lose internal force?"

Zhou Botong was stunned, he had lived for so long, and he had never seen that internal force could be transformed into 'rice', but he remembered that he had never encountered such a fun thing before, and he was quickly relieved.

"Then can you give me this secret method, and I will use my internal force to convert it into electricity."

Di Wenchang silently praised Zhou Botong in his heart, although Zhou Botong was naughty, he was also kind, his first reaction was not to let others consume internal force to transform, but to hope to use his own internal force to exchange.

However, he didn't really have this method, shook his head and continued to talk nonsense: "It's not that I won't teach you, but you can't learn this secret method at all." ”

"What? I can't get the hang of it? Zhou Botong was unhappy and said angrily: "I, Zhou Botong, am talented and intelligent, where is there anything that I can't learn from Zhou Botong." ”

Di Wenchang didn't refute him, and smiled, "That's because every time you use this secret method, you need to make precise calculations, and the so-called calculation means to do arithmetic problems, can you do it?" ”

Arithmetic is the oldest and most primitive part of mathematics, and at this time there was already a saying about arithmetic, and Zhou Botong understood it as soon as he heard it.

He slapped it a few times on his chest, and said loudly: "What arithmetic is that I Zhou Botong can't calculate, you can tell me." ”

"Alright then, I'll test you a few simple ones."

Di Wenchang thought for a moment and began to draw circles on the ground.

The room was quite big, enough to draw some small circles.

One in the first row, two in the second, three in the third, and so on, and then stop at the tenth line, which is the simplest problem of equal differences.

He pointed to the circles and said, "Look at this simple arithmetic, one circle in the first row, two in the second row, three in the third row, and so on, until the hundredth line, can you count how many circles there are here?" ”

“……”

Zhou Botong was stunned.

He was already not very flexible in his brain, and it was impossible to calculate such a problem now.

However, he was unwilling to admit defeat, and said stiffly: "This can't be calculated, you can only be counted, you ...... You can't figure it out either! ”

Di Wenchang smiled, "This is not necessarily, I can still figure it out immediately, let me see, well, it is exactly five thousand and fifty circles." ”

The calculation method of this equal difference series is to add the beginning and end by multiplying the total number and then dividing by two, and the oral arithmetic is easy to calculate, for example, to a hundred rows, the number of circles is equal to 100 plus 1 times 100 divided by 2, which is equal to 5050.

Of course, this dynasty did not have Arabic numerals, but only used words or 'chips' to record numbers, which are somewhat similar to Roman numerals.

Zhou Botong didn't believe it, "Five thousand and fifty? How do I know if what you said is right, and besides, you may have counted it a long time ago, and you want to use this to deceive my old urchin, hmph, no way!. ”

After speaking, you looked like you were seen through by me, and you looked proud.

Di Wenchang was not annoyed, and said calmly: "Yes, you can draw it yourself to count, as for what you said, I already know the answer, so let's just say the number, how many lines are there, I will calculate it for you immediately." ”

"What you said is true?"

Zhou Botong's eyes lit up, as if he had seized an opportunity to fight back.

"Of course it's true!"

"Okay, I'll test you."

Zhou Botong was interested, and the matter of the mobile phone was also put aside, he squatted down with the stone, and 'pondered' for a while before saying: "You told me how many circles there are in the tenth line." ”

In just a few seconds, Di Wenchang blurted out: "Fifty-five." ”

"Fifty-five ......" Zhou Botong's smile stiffened slightly.

In fact, he was counting the number of circles on the ground just now, and he knew that Di Wenchang had answered correctly, but he still didn't want to admit defeat, and shook his head and said: "No, no, it's too simple, my old naughty boy can also calculate it." ”

Di Wenchang's face was calm, "Then you can ask again." ”

"You count me to twenty lines, no, to twenty-one circles."

"By twenty lines there are two hundred and ten, and by twenty-one lines two hundred and thirty-one."

Di Wenchang still answered quickly.

However, after he reported the number, Zhou Botong suddenly paused, because only the tenth line was drawn on the ground, and he didn't know how many twenty lines there were.

He coughed lightly, hiding his embarrassment, and said, "Ahem, my old naughty boy admits to figuring it out, but I don't believe what you said is right, wait for me to count it." ”

Di Wenchang just glanced at him and said casually: "Whatever you want, tell me when you count it." ”

Zhou Botong felt slighted and angry, but now it was not easy to attack, so he could only hum: "You wait for me!" ”

After saying that, he squatted on the ground and began to draw circles.

Zhou Botong's speed is not slow, and he has already learned the technique of two-handed fighting, holding stones in both hands, and quickly draws.

It took a little more time to count the circles drawn, and found that it was exactly the same as what Di Wenchang said.

Di Wenchang smiled: "What's the matter, what I said is right, right?" ”

"I ...... This ......"

Zhou Botong struggled for a long time, but he was unwilling to give up the opportunity to learn the 'secret method', so he simply played tricks.

He pointed to the circles and said, "These circles are too few, you must have memorized the number of circles to a hundred lines a long time ago, no, I will test you again!" ”

Di Wenchang already knew that Zhou Botong couldn't admit defeat so easily, so he said indifferently: "Okay, then you can say it, you name a number, and I will calculate it for you immediately." ”

"Okay, listen to me!"

Zhou Botong was stimulated by Di Wenchang's indifferent attitude, stood up, and spun in circles in place, while thinking about what kind of number to say in order to defeat Di Wenchang.

After a while, Zhou Bo said: "Then you can calculate how many circles there are in one thousand and one rows." ”

"A thousand and one lines?"

Di Wenchang frowned, calculated the answer in his heart, and found that mental arithmetic was still relatively difficult, so he picked up a stone and calculated it on the ground.

"Well, I can't figure it out!" Zhou Botong saw that he didn't say the answer immediately, and thought that he couldn't figure it out, so he immediately became proud.

Seeing Di Wenchang scribbling and painting on the ground, he thought he was going to draw circles, and immediately said: "It's useless for you to draw circles, and what you draw doesn't count." ”

It's a pity that he thought wrong, Di Wenchang just squatted down for a while, then stood up again and said, "There are five hundred and one thousand five hundred and one circles. ”

"What?! Fifty one million five hundred and fifty one? ”

Zhou Botong was stunned again, because he didn't have much concept of the word Wan in his mind.

"That's right! 501,500 circles, that's the number, don't believe you go and count it yourself, after counting, you can come to me in the back mountain. ”

After saying that, he walked out the door, it was still early, and he was going to go to the morning exercise first.

Di Wenchang knew that it was impossible for Zhou Botong to admit defeat immediately, at least before he got the real answer, he would definitely go to someone to help figure it out. He is not in a hurry, it is worth spending a little more time to get the general outline of the Nine Yin True Scripture.

Sure enough, not long after he left, Zhou Botong rushed towards the council hall, obviously looking for the help of the seven sons of Quanzhen.

It's just that he doesn't know at all, even if Huang Rong comes, I'm afraid it will be difficult to really calculate it, let alone the Quanzhen Seventh Son?