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page 189
After all, to build a skyscraper, you have to lay the foundation first.
Yun Yan felt that this teacher was really heart and soul.
She sincerely thanked again.
After speaking, Yunyan followed the other students to gather.
Teacher Zhang has known this serious teacher for many years, and they talked for a while.
"The books you recommended to Yunyan are really difficult."
The difficulty is so great that he, who only studies the Olympiad, has heard of several books.
The serious teacher said, "Don't young people like to be competitive? You, a student, will ask me if you don't understand, and then I will let her enter our mathematics department."
Teacher Zhang: "..." I can think of this in a short time.
admire.
After eating in the cafeteria at noon, Teacher Zhang took everyone to sit on the lawn by the Weiming Lake.
It is known as 'outing the green'.
All the students present were twitching their mouths, as if struck by lightning.
"Outing..."
"It turns out that this is outing, I learned it."
Qian Xingwei sat next to Yunyan and said, "With this free time, we might as well turn the Rubik's cube for a while."
He was professionally trained as a child.
No matter the fifth or fourth order, or even the pyramid or hexagonal devil's cube, Qian Xingwei has a way of turning.
Qian Xingwei can also see that Yun Yan is purely from a wild way.
She can turn so fast, purely because people are smart and have quick brain responses, so that she can calculate the steps to turn the Rubik's cube in a limited time.
But Qian Xingwei is also willing to share his experience and methods.
It's just that the time was limited before, and was busy listening to Teacher Zhang's new IMO question types every day, so didn't have time.
Lu Lin heard Qian Xingwei's words.
He moved his seat on the spot, instead of sitting next to him, he moved to Yun Yan's side.
ββQian Xingwei is too devilish, but Yunyan is more cute.
Who knows that Lu Lin is still too young, and the most devilish talent is not Qian Xingwei.
It's Teacher Zhang.
I saw him open the school bag he was carrying, and took out a bunch of Rubik's cubes from it.
I dug out and pulled out an hourglass.
Teacher Zhang happily turned the hourglass upside down.
"Don't you always say that you don't have enough time to play Rubik's cube? Let's play as much as we like this afternoon."
classmates:"β¦β¦"
Maybe this is the generation gap.
Teacher Zhang asked everyone to come and choose, the third- and fifth-order ones are more popular.
Because these two rotations are quite a routine, first align the color of the center, and then make adjustments.
Although the fourth-order Rubik's Cube does not sound as powerful as the fifth-order Rubik's Cube, if you want to restore it, the possibility of path changes is more than that of the fifth-order Rubik's Cube.
And there are fewer useful routines.
So, in general, the fourth-order Rubik's cube is actually a bit more difficult than the fifth-order one.
The only two fourth-order Rubik's cubes in Teacher Zhang's backpack finally fell into the hands of Qian Xingwei and Fang Yunyan.
At the beginning, everyone also discussed the skills of turning the Rubik's cube.
Then guide each other.
Thirty minutes later, all of them gathered around Yun Yan and Qian Xingwei, watching whoever turned faster.
Teacher Zhang also held up his sacred hourglass and leaned over.
"This hourglass is ten minutes, see who of you can recover within this time."
Yunyan: "..."
Qian Xingwei: "..."
Classmates: "..." Teacher, you are really too young.
Turning a fourth-order Rubik's Cube, these two bosses can't use it for five minutes.
However, the fun of the Rubik's Cube is not how fast it can be recovered.
But every time the pattern is scrambled, the process of restoration is deduced.
About half an hour later, Teacher Zhang put away the hourglass angrily.
He thought that he had to return it. It looked good and bought it back. It was useless at all.
The spring breeze is blowing, and a group of students who are jumping on the edge of adulthood are sitting by the lake.
Watching the girl in a distressed denim jacket turning the Rubik's cube seriously.
The phalanx is slender, with well-defined joints, and the skin on the back of the hand is so tender that water can be pinched.
The girl lowered her head, and her long eyelashes could not hide the seriousness in her eyes.
Under the high-speed rotation of the fingers, the moment the Rubik's cube was turned, the strength of the hand loosened.
The Rubik's Cube fell on the lawn.
Someone next to him took a mobile phone and started a stopwatch.
"Damn it! One minute and thirty-one seconds! Yunyan took less than two minutes! Faster than Brother Wei just now!"
"Yunyan is really awesome!"
"The first place is the first place, and it's really awesome."
"Yunyan is a really good goddess. I've never seen a girl play Rubik's cube so well."
"Come on, don't sigh, let's see Brother Wei again, the timer starts!"
At four o'clock in the afternoon, Teacher Zhang announced the end of the first spring outing.
Everyone stood up from the lawn in unison.
"Mr. Zhang has a good heart."
"It's the first time in my life that I've been out in the green for the first time."
"Mr. Zhang, there is no homework today, right?"
Teacher Zhang really thought that everyone was praising him, smiling all over his face.
"Yes, I also think this way of outing is very unique and educational. There is no homework today. We will go to the next school tomorrow, and everyone will speak on the stage, and your future brothers and sisters will listen in the audience."
"...what's the matter?"
Someone asked tremblingly, "Teacher, do you really plan to let us teach the Olympiad to the brothers and sisters of Tsinghua University?"
Teacher Zhang is very confident in everyone.