Chapter 5

After a few minutes of excitement, the same question came to mind.

“7812378*7812378=……”

？？？

？？

Still can't do it in a second. What's going on?

As... Cough, a genius, should not be difficult by this kind of problem!

Zhang Yuan frowned, and a multiplication vertical appeared in his mind. He stumbled for half a minute before jumping out of the final result.

“61033250014884。”

OK, it's still done.

After thinking about it carefully, a flash appeared on his face.

"I see... When I met this problem, I solved it directly by computer, so that my computing skills degenerated greatly. If you don't have to think about it, even a genius can't jump out of the answer immediately... "

"It's slow now, just because I don't have enough proficiency and don't master relevant skills. If you use mental arithmetic for a long time, you will get better slowly. "

The next day

Zhang Yuan woke up bleary eyed and rubbed his confused head.

Maybe it was because I was too excited last night and kept testing my IQ. I couldn't sleep for a long time. When I finally fell asleep, it was almost dawn.

Look, it's 10 o'clock.

"No!"

Zhang Yuanyi rolled up from the bed, washed quickly for a while, and then hurried out of the house.

"I hope I'm not late, or my sister-in-law will talk for a long time..."

The 30 day holiday is very urgent. There are clear arrangements for each day. I've made an appointment today to go to my aunt's house for lunch.

In July, Donghua city was like a stove, the heat wave was rolling, and the roadside plants were in deep water.

Zhang Yuan hurried to the subway station, where there is always comfortable air conditioning.

There is no shortage of energy in this era. The power generation capacity of each large fusion nuclear power station is comparable to that of the Three Gorges hydropower station, and the price of domestic electric energy is as low as 3 cents.

Thanks to this, in addition to the high price of original petroleum derivatives such as plastics, high-energy industrial products such as steel and cement have become extremely cheap.

Especially with the vigorous development of nanotechnology, building materials are also being updated from generation to generation. For a simple example, if 6% of cement is added to nano silica, the compressive strength can be increased twice and the workability of concrete can be improved in an all-round way.

With the popularization of cheap new materials, the surface buildings in the city are getting higher and higher, and kilometers of high-rise buildings can be found everywhere.

Two hundred years ago, the 828 meter high Dubai Tower was the tallest building in the world, but now it can only be the tallest building in the village.

And... At least five can be built at the same cost!

Some transportation tracks are even placed thousands of meters high, with skyscrapers as the track pillars.

These are popular in almost all big cities, and the air track has become the facade of big cities.

"Many people."

Donghua is one of the five first tier cities in Xia. Even if the morning peak has been missed, the subway station is still crowded.

"Dear passengers, please give courtesy to the elderly and children."

"Please don't smoke or beg in the carriage."

It is impossible to solve the traffic problem completely.

Sprayers can always find the most comfortable angle to attack the government. If the transportation is too crowded, the government will be sprayed; However, if there are too many subways and there are a large number of empty seats, it will be regarded as "a waste of taxpayers' money". Anyway, it will be sprayed anyway. Just get together and use it.

Zhang Yuan lined up behind the line and heard someone complaining about "not increasing the number of trains" and so on. He smiled in his heart. He didn't have too many ideas, but picked up his mobile phone and brushed the questions.

This is a very popular "Super Brain" app, which can examine a person's memory, arithmetic ability and reasoning ability. Anyway, being idle is boring. It's also good to brush a few questions. By the way, test your IQ.

IQ is his biggest concern at present.

Every time I measure my IQ is very high, I feel so happy that it is difficult to describe in words.

The subway station is very noisy and difficult to concentrate, but I don't know what's going on. Doing the topic will always produce a wonderful sense of achievement, which makes him feel like eating chocolate beans.

Maybe after using that medicine, you have an attribute called "workaholic"?

"I finally understand why some people are willing to work all day. It turns out that they are happy and don't want to. Using your brain has become a very fun thing! "

Ding Dong

When the subway entered the station, the crowd poured in like a tide, and the original queuing area was emptied.

Zhang Yuan walked into the subway, found a place to stand, and painted one topic after another.

With the increase of proficiency, the four seven digit operations have changed from half a minute to 10 seconds, and the operation speed is increasing.

The feeling that the answer was ready to come out finally slowly appeared.

The more he used his mind, the more clever he became. The result satisfied him.

Soon, he began to be dissatisfied with the ordinary four operations and became the open square operation.

"Let's start with a simple one, √ 7812 (keep four significant digits)"

Zhang Yuan raised the difficulty for himself.

There are many different ways to manually square an integer. The most conventional one is called quotient test, which is a bit similar to division. As long as the mental calculation ability is enough, it can be calculated directly.

Some algorithms are a little troublesome, such as continued fraction expansion, dichotomy, Newton iteration and so on.

Fifteen seconds later, he came to a concrete conclusion.

“√7812=88.38……”

The answer is correct!

“√444”

“21.07”

The answer is correct!

ha-ha!

Is this... The feeling of being a genius?

Really... Fragrant!

The carriage is very quiet. Except for the electronic prompt sound of the subway, everyone is busy immersing themselves in their own world.

Occasionally, there are a few guys who don't know whether to read novels or videos. When they see the climax, they can't help laughing, just like fools

"The fragmented time on the subway should be used to improve themselves, not entertainment!"

A "well-known" who came back from studying abroad frowned and was feeling this bad social atmosphere.

The phenomenon of "bow heads" is often criticized by major media, but it is not very useful to criticize. We should play and bow our heads. We can't let the government legislate to prohibit playing mobile phones in public places, can we?

The man's name is Ye Fan. In his cognition, in the subway abroad, everyone is reading newspapers instead of playing mobile phones. The atmosphere is 100 times better than Xia Guo (in fact, there is no Internet).

Anyway, in his impression, young people abroad live much healthier than young people in Xia country!

"No wonder these people can't go to space. That's because they spend their study time on entertainment... It's strange to go to space!" Ye Fan thought secretly.

"What's the word? I just spend other people's coffee time at work... "

Especially the young man in short sleeves showed a honey smile on his face.

Tut Tut, should I be in love with a second dimensional girl?

Worthless!

(first, explain the title of the book. I wanted to name it "deep space era", but it's too serious. The click through rate will be very low.)

(science fiction, as we all know, although "wandering the earth" is popular, it doesn't mean that other science fiction can also be popular. Most people probably don't want to read the title of the deep space era. They don't want to order it at all.)

(if you think about it, you'd better change it to this, "deep space ball length", which sounds very rustic, but the click through rate should be higher...)