When he passed by Yang Wei's side, Lin Zifeng glared at him unceremoniously, his eyes were clearly blaming him, why didn't he wake himself up when he saw Old Man Sun coming over. Pen | fun | pavilion www. ｂｉｑｕｇｅ。 ｉｎｆｏ

Yang Wei rubbed his bloodshot eyes, and wiped the corner of his mouth with the back of his hand, although he didn't respond, he told him with practical actions, buddy, I just woke up!

Lin Zifeng walked up to the podium speechlessly, and Tang Zhuojie, a good student standing on the other side, glanced at him with contemptuous eyes, and then pinched the chalk in his hand and wrote a beautiful explanation in italics under the big question.

Tang Zhuojie, a good student with top grades, has never looked at the existence of Lin Zifeng in his eyes, and even stood with him to solve the same problem, Tang Zhuojie felt that it was a shame. So what Tang Zhuojie wants now is to solve this problem as quickly as possible, and leave the poor student Lin Zifeng alone on the podium, so that the level is obvious.

Three minutes passed, and the chalk in Tang Zhuojie's hand never stopped, and the constant sound of brushing in his ears also made Lin Zifeng upset. In the past few minutes, he had read every word in the math problem, and he had read it several times, although he knew every word, but Lin Zifeng was confused.

"MD, what kind of question did Old Man Sun come up with?" Lin Zifeng scolded in his heart, his head unconsciously tilted to the side, and he aimed at most of the board written by Tang Zhuojie.

At this time, Tang Zhuojie had already written more than a dozen steps to solve the problem on the blackboard, and he added three or four auxiliary lines to the already complex shape, which looked even more complicated.

"Teacher!" Noticing that Lin Zifeng was peeking at his own solution method, Tang Zhuojie deliberately stopped and shouted loudly.

Old man Sun was still walking back and forth in the classroom, but when he heard Tang Zhuojie's shout, he immediately looked up and saw Lin Zifeng's behavior on the podium, and reprimanded him sharply, "Be your own, don't peek!" ”

There was a low snickering in the classroom, although the students who were not named at this time had to complete the problem in their seats, but only a few of the students would be so honest, and most of the others were just pretending. What's more, today is a competition between the three good students and the school celebrities, and this good show is not seen in vain.

However, until now, the forum celebrity Lin Zifeng is obviously at an absolute disadvantage, because until now, the chalk in his hand has not written a word on the blackboard.

Some classmates began to secretly discuss at the bottom, "Look, I knew it would be like this, it was just two days old, and now it was immediately beaten back to its original form." ”

"I don't know how he got involved with the little demon girl of the school flower, but now it seems that he is still a ** silk!"

"Agreed, if I could at least draw the first auxiliary line, he wouldn't even know this step, it's too stupid!"

"If you put it in normal times, you can copy other people's foolish passes, but now you can't copy it while standing on the podium, I want to see how he ends."

"Haha, let's wait to see the show..."

Under the podium, Yao Mengqi also looked up at Lin Zifeng, and her beautiful eyes wrinkled slightly. Yao Mengqi is not only the school flower of No. 1 Middle School, but her academic performance is also very good, and she has always been in the top ten in her class. Although this question on the blackboard is indeed very difficult, even Yao Mengqi himself can only solve half of it, but how can he not write a single step?

In fact, Yao Mengqi felt a little guilty about Lin Zifeng in her heart, she knew very well that Lin Zifeng did not confess to herself, but because her sister was burdened with the black pot for no reason, she became the laughing stock of all the students of the first middle school. Fortunately, with the appearance of the little demon girl, this matter did not develop in a worse direction. It is precisely because there is a little demon girl by Lin Zifeng's side that Yao Mengqi's impression of him has changed slightly, after all, such a big beauty would not follow a good-for-nothing person for no reason, but now...

Yao Mengqi sighed lightly with some disappointment, if you want to say what kind of boy she will like, in fact, whether she is handsome or not, whether the family is rich or not, is not the most important thing for Yao Mengqi. But there is a very critical point, that is, you must not be stupider than her, and now it seems that Lin Zifeng is not in line with it. The trace of goodwill in Yao Mengqi's heart gradually disappeared without a trace at this moment.

Five minutes later, Tang Zhuojie, who had been writing hard, suddenly stopped, his originally relaxed expression became more and more serious, and his brows were twisted. Tang Zhuojie found that although he used seven or eight formulas, and the auxiliary line was drawn to the fifth, the things he deduced were getting farther and farther away from the conclusion, and he actually came to a dead end.

Lin Zifeng stopped when he heard the voice in his ears, and thought that Tang Zhuojie had finished his solution and was about to step off the podium, but he didn't expect to wait for a while but there was no movement. Originally, Lin Zifeng was also going to give up, the difficulty of this question was far beyond his level, he was ready to walk off the podium with him once Tang Zhuojie finished solving it, Old Man Sun wanted to kill the chicken to show the monkey The purpose has been achieved, and he will not do anything with him.

Just when Lin Zifeng was wondering, when his eyes were last aimed at the geometric figure on the blackboard, he suddenly found that what he saw had changed very strangely.

Originally, it was just a two-dimensional figure drawn on the blackboard with chalk, but in Lin Zifeng's sight, the two-dimensional figure was slowly becoming three-dimensional, as if it had jumped out of the blackboard, Lin Zifeng could easily see every side of the figure before and after!

One of the most important reasons why solid geometry in high school is so difficult is that students have to imagine what it looks like by drawing two-dimensional figures on test papers or textbooks, and then deduce conclusions from non-existent three-dimensional shapes in combination with known conditions.

But the most difficult step at the moment was not established in front of Lin Zifeng, and he directly saw the appearance of each part of the figure on the three-dimensional geometry through different perspectives!

Then, Lin Zifeng tried to add the known conditions to the stereoscopic image in front of him step by step, and each time he added a conditional image, he became more perfect. It wasn't until all the conditions were added that Lin Zifeng found that if he looked at the figure from a top-down perspective, the conclusion that needed to be deduced from this question was simply clear at a glance!

Between all the known conditions and conclusions, it is easy to deduce by drawing an auxiliary line that goes deep into the center of the solid circle.

Lin Zifeng was overjoyed, and the chalk he had been holding in his hand finally quickly wrote on the blackboard. Although this rustling sound was not loud, it attracted the attention of all the students and Teacher Sun, and an incredible exclamation sounded, "He, actually started to solve?" ”