A nation's industrial development begins with junior engineers.

Seeing this, Jiang Dong hid behind a chair.

"What should we do? Fourth brother said this thing seems quite valuable~"

"But I often see my brother patting that box, saying that if it misbehaves, a pat will make it behave?"

Thinking of this, the girl mustered her courage and started gesturing at the screen: "You're not allowed to throw a tantrum! Or I'll hit you! I'm heavy-handed!"

To make her point more convincing, the little girl picked up her pencil and snapped it in two.

"Hey, yes, it works!"

The screen indeed stopped refreshing.

It slowly displays a series of equations: 2+2=4.

The little girl counted on her fingers, "Hey, you got it right!"

"4+5?" the little guy asked, climbing back onto the chair and tapping away little by little.

This time, the screen didn't display too many processes; it simply gave the answer: 4 + 5 = 9.

"You got it right again! You're really good at math!" The little girl's eyes sparkled.

Hehe, now comes the difficult part!

Continue by entering 11+4=.

The little girl looked at the 15 displayed on the screen, took off her shoes, and started counting them one by one.

"Oh dear, you miscalculated! It's 16!"

"Wait, did I add an extra 2?"

"Hehe, you're right!"

Verification complete!

This big machine can actually do arithmetic.

So the little girl bent over and typed in all the calculation problems from her workbook, then wrote down the answers in her notebook.

In no time, the notebook was filled out.

"Fourth brother, fourth brother! I'm done calculating! Quickly check it for me!"

The little girl was so excited that she didn't even put her shoes on properly; they just dangled and swayed as she ran into Jiang Qiu's room.

Jiang Qiu was deep in thought about a problem: Given the function \(f(x)=x^{2}+2x - 3\), find the maximum and minimum values ​​of the function on the interval \([-2,1]\).

Seeing his younger sister run in, he sighed, "You're not scribbling again, are you...?"

The last time I checked her homework, it was the same. She was okay with five-digit addition and subtraction, but once she got to that, she started writing nonsense.

"do not have!"

"Alright, one spanking for every mistake!" Considering Jiang Dong's resilience, he added, "With a rattan cane!"

Hearing that a cane would be used, the little girl couldn't help but shrink back: "You should investigate first!"

Jiang Qiu picked up the homework and looked at it. Hey, it was all correct!

Hey, little sister, you've been working hard lately!

This is the result of doing lots of practice problems! A sea of ​​problems breeds talent! Jiang Qiu firmly believed in this saying, after all, that's how she learned herself.

Jiang Qiu glanced at Jiang Dong, then pulled out a candy and popped it into Jiang Dong's mouth. "Fifth Brother, this is your reward for this time!"

"Do you want more rewards? If you do, do the questions here too! I'll give you another one!" Jiang Qiu took out her old workbook and waved it at Jiang Dong, who was chewing on a milk candy with both hands like a little hamster.

Jiang Dong peeked out at the question and immediately felt a headache coming on.

20+5 and so on, there aren't enough to count on your fingers.

But then I remembered my helper; it should be able to do it.

Cricket arithmetic, I have a good friend!

"One candy as a reward for each page?"

"Uh~" Jiang Qiu looked at the only four or five milk candies in his drawer and felt a little reluctant.

But then she slapped her forehead and realized, "What's there to be reluctant about? If she can get half of this question right, she'll be considered to have figured it out."

"Row!"

Jiang Dong stepped forward, snatched the exercise book, and ran out, wiggling his little bottom.

"Hey! Where are you going? Just write here with me, don't waste electricity by turning on the lights!"

"No! I'm afraid of disturbing you!"

Hearing this, Jiang Qiu felt a warmth in his heart. His little sister had grown up!

Watching Jiang Dong run away, Jiang Qiu turned his thoughts back to the problem in front of him: First, complete the square for the function \(f(x)=x^{2}+2x - 3\), and we get \(f(x)=(x + 1)^{2}-4\). Draw the parabola of the function. Hmm, it opens upwards, so the axis of symmetry should be \(x=-1\).

So, when...

"Fourth brother, fourth brother! I've finished calculating one page!"

Jiang Qiu, whose train of thought was interrupted again, curiously picked up the homework book. "So fast? If you get one wrong, you won't get any candy!"

"Hey, all correct again! Fifth Brother, you've really figured it out!"

Upon hearing this, Jiang Dong popped out a big snot bubble.

"Give me milk candy, give me milk candy!"

"Alright, here you go~~ Do you want to continue the challenge?"

"want!"

Tap tap tap tap, Jiang Dong ran off again.

江秋继续那道未完成的题目：当\(x=-1\)时，\(f(-1)=(-1 + 1)^{2}-4=-4\)，此为函数的最小值。

然后分别计算区间端点的值，(f(-2)=(-2)^{2}+2*(-2)-3=-3\)……

Hmm, I'm a little stuck...

"Fourth brother! Fourth brother! I've finished two pages! Hurry up and give me some milk candy!"

Jiang Qiu was a little frustrated. You all know the pain of having your problem-solving process constantly interrupted and your thoughts unable to connect.

I took the notebook, checked the calculations, and found they were correct.

Jiang Qiu took out two milk candies and sent Jiang Dong away.

My attention returned to the problem in front of me.

Hmm~~

Ugh, what's the next step? That damn fifth brother keeps interrupting!

Eh, that's not right.

There was a math problem just now, involving addition and subtraction within 20, and Jiang Dong was able to solve it?

Jiang Qiu stood up and looked towards the main room.

It's dark, no lights on? Where did this little girl go to write?

After searching, they finally found her in Jiang Xia's room.

At that moment, Jiang Dong was sticking his butt out, typing on the typewriter keyboard, muttering, "I've decided to be your friend, okay? This time we'll win all of Lao Si's milk candies! I saw it clearly, there were only 3 left in her drawer. We won't do anything that loses us out!"

"I'll give you two later!"

Jiang Qiu tiptoed inside and watched in surprise as Jiang Dong pressed a string of numbers with his little paws.

23+7=30

The results displayed on the screen made Jiang Qiu cover her mouth in disbelief. Her brother's machine really could calculate!

"Another question! Keep going, only 3 more questions and it'll be another passage!"

Jiang Dong happily filled in 30 in his workbook and continued pressing the buttons.

That's right, China's first usable transistor computer has appeared!

Although its first step in the calculation was to help a carefree little girl win some milk candy.

This is all thanks to the extra monitoring program that Jiang Qiu entered after inputting the BIOS settings. This short piece of machine language, only a few kilobytes in size, is capable of performing simple two-digit calculations thanks to its unique architecture and operating environment.

I wonder what Jiang Xia's expression will be when he finds out that his silly little sister actually managed to use it by accident.

In any case, Jiang Qiu and Jiang Dong's expressions were quite different, especially when they looked at the two leather-clad men who had suddenly appeared in front of them.

!

Jiang Qiu shielded Jiang Dong and retreated hastily, opening her mouth as if to shout.

Unexpectedly, the man moved with lightning speed, covering her mouth and nose in one swift motion. At the same time, he wrapped one arm around her, firmly controlling Jiang Qiu's arm as she tried to resist.

Upon realizing he couldn't move, Jiang Qiu's mind calmed down, and he looked at Jiang Dong.

Jiang Dong's eyes darted around, sometimes looking at the man holding his sister, sometimes at another man guarding the door.

"Behave yourself! Don't move! Where are your parents? What's that machine in front of you?!"