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

“7812378*7812378=……”

？？？

？？

Still can't make it in a second, what's going on?

As...... Ahem, a genius, shouldn't be bothered by this kind of question!

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

“61033250014884。”

It's okay, it's still made.

After thinking about it carefully, a hint of surprise appeared on his face.

"I see...... It turned out that when I encountered this kind of problem, I solved it directly by the computer, so that my calculation skills degraded significantly. If you don't think about it, even if you are a genius, you can't jump out of the answer right away......"

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

Day 2......

Zhang Yuan woke up sleepily and rubbed his confused head.

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

At first glance, it was already 10 o'clock.

"Oops!"

Zhang Yuan rolled up from the bed, washed up quickly for a while, and then hurriedly walked out of the house.

"I hope I won't be late, otherwise my sister-in-law will be chattering for a long time......"

The 30-day holiday is very urgent, and there are clear arrangements for each day, and today I have made an appointment to go to my aunt's house for lunch.

In July, Donghua City is like a furnace, the heat wave is rolling, and the plants on the roadside are in dire straits.

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

There is no shortage of energy in this era, and the power generation of each large-scale fusion nuclear power plant is comparable to that of the Three Gorges Hydropower Station in the past, and the price of domestic electricity is as low as 3 cents a kilowatt-hour.

As a result, in addition to the high prices of petroleum derivatives such as plastics, energy-intensive industrial products such as steel and cement have become extremely cheap.

In particular, the rapid development of nanotechnology has led to the upgrading of building materials from generation to generation. As a simple example, if 6% of cement is added to nano-silica, the compressive strength can be increased by 2 times and the workability of concrete can be improved in all aspects.

The popularity of cheap new materials has made the city's surface buildings higher and higher, and kilometers of high-rise buildings abound.

Two hundred years ago, the Burj Khalifa was the tallest building in the world at 828 meters, but now it is the tallest building in the village.

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

Some of the traffic rails are even placed at a height of thousands of meters, with skyscrapers as the pillars of the tracks.

These are popular in almost all big cities, and the air track becomes the façade of the big city.

"That's a lot of people."

Donghua City is one of the five first-tier cities in Xia China, and even if the morning rush hour has been missed, the subway station is still crowded.

"Passengers, please be polite to the elderly and children."

"Please refrain from smoking or begging in the carriage."

It is impossible to completely solve the traffic problem.

Trolls can always find the most comfortable angle to criticize the government, and if the transportation is too crowded, the government will definitely be sprayed; But if there are too many subways and there are a lot of empty seats, it will be considered a "waste of taxpayers' money". Anyway, it's going to be sprayed anyway, so you can use it alive.

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

This is a very popular "Super Brain" app, which can test a person's memory, arithmetic ability and reasoning ability, and it's boring to be idle anyway, and it's good to brush a few questions, and by the way, test your IQ again.

IQ is his biggest concern at the moment.

Whenever I measure my IQ is very high, the feeling is so refreshing that it is difficult to describe in words.

The subway station is noisy and difficult to concentrate, but he doesn't know what's going on, and doing the problem always produces a wonderful sense of accomplishment and makes him feel like eating chocolate chips.

Could it be that after using that potion, there is an additional attribute called "workaholic" on the body?

"I finally understand why someone wants to work all day long, because they are happy and don't want it. Using your brain has turned out to be a lot of fun! ”

Ding dong......

When the subway entered the station, the crowd poured in like a tide, and the area where the queue was originally lined was emptied.

Zhang Yuan walked into the subway, found a random place to stand, and brushed up on one topic after another.

With the increase of proficiency, the seven-digit four-digit operation has changed from the original half-minute operation to 10 seconds, and the calculation speed is still increasing.

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

The more he used his brain, the more clever he became, and this result made him feel satisfied.

Soon, he began to be dissatisfied with the ordinary four-rule operation, and became an open-squared 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 test quotient, which is a bit similar to division, as long as the mental arithmetic ability is sufficient, it can indeed be calculated directly.

There are also some algorithms that are a little more cumbersome, such as continuous fractional expansion, dichotomous method, Newtonian 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!

That's what it is...... How does it feel to be talented?

True...... Fragrant!

The carriage was quiet, and everyone was busy immersed in their own world, except for the electronic chime of the subway.

Occasionally, a few guys, who don't know whether to read a novel or watch a video and see the climax, can't help but laugh, like fools......

"Fragmented time on the subway should be used to improve yourself, not to entertain!"

A "public intellectual" who returned from studying abroad frowned, feeling this bad social atmosphere.

The phenomenon of "bowing heads" is often criticized by major media, but it is not much use to criticize it, everyone should have fun, and everyone should bow their heads, and they can't let the government legislate to prohibit playing mobile phones in public places, right?

This man's name is Ye Fan, and in his cognition, in the subway abroad, everyone is reading newspapers, not playing with mobile phones, and the atmosphere is a hundred times better than that of Xia Guo (in fact, there is no Internet).

Anyway, in his impression, young people abroad live a much healthier life than young people in Xia Kingdom!

"It's no wonder that these people can't go to space, it's because they spend their time studying for fun...... It's weird to be able to go to space! Ye Fan thought secretly.

"What's the name of the saying? I just spend all my coffee time at work......"

Especially the young man in short sleeves next to him actually had a honey smile on his face.

Tsk, it's supposed to be in love with a two-dimensional girl, right?

Unpromising!

(First of all, explain the title of the book.) I originally wanted to name it "Deep Space Era", but it was too serious, and the click-through rate would be low. ）

(Science fiction, everyone understands, although "The Wandering Earth" is a hit, it doesn't mean that other science fiction can also be popular.) When ordinary people see the title of "Deep Space Era", they probably don't want to read it directly, and they don't want to order it. ）

(Think about it, let's change it to this, "Deep Space Ball Length", it sounds like a lot of dirt, but the click-through rate should be a little higher...... ）