Xueba couples do not study

Chapter 439 Answer a question in ten seconds. (seeking a reward)
The team competition in the morning officially started. While flipping through the ppt, the referee said, "Then, all contestants, please read the first question."

After hearing what he said, everyone looked at the topic displayed on the big screen in front of them.

1. Suppose the real number a satisfies a<9a-11a<亅a亅, then the value range of a is ()
As soon as the question came out, everyone started to pick up the carbon pens they had on hand, and began to calculate the answer to the question on the scratch paper.After Lin Sheng and He Yang saw the topic, they picked up the pen and wrote a few strokes on the draft paper without haste.

When Lin Sheng figured out the answer, he was still a step behind.

Only a sound of "ding" was heard, and the problem had already been solved.

When the narrator heard the sound of 'ding', he looked at the place where the sound came from: "Congratulations to He Yang from High A for winning this question, please answer the answer to this question."

"Sorry, Sheng," He Yang said to Lin Sheng in a low voice, then picked up the microphone on the table, and began to speak the answer to this question, "(-2 root 3/3, - root 10/3 )."

After he gave the answer, the referee glanced at the answer sheet in his hand and did not speak for a long time.Just when others thought his answer was wrong, they heard the referee say:
"Congratulations to He Yang, the A-high player, for answering this question correctly, the A-high will add [-] points!"

After hearing the referee's words, everyone in the auditorium of High A applauded enthusiastically.Some people only realize a very important thing after a while.

How much time did He Yang take to answer this question just now!
If they remember correctly, it seems to be almost ten seconds!
This speed is really worthy of He God!too strong!
If He Yang heard what they were thinking, he would definitely say: I still think it is a bit slow at this time. In the past, it would take six or seven seconds to solve it.

The referee said: "Everyone, please come on, let's look at the second question below."

The ppt on the big screen turned another page, and what was displayed on the big screen was the second question of the team competition.

2.设复数z、w满足|z|=3，（z+w）（z-w）=7+4i则（z+2w）（z-2w）的模为（）
After seeing this question, everyone in the audience froze in place. There are two formulas on this question. It seems difficult. If you solve it faster than others, it will be even more difficult.

This question has more steps than the first question. If you only need to list a combination for the first question, then the most complicated part of this question is the subsequent calculation besides the combination.If you are not careful, you will give the wrong answer.

At this tense moment, there was another 'ding' sound.

The referee subconsciously looked in the direction of Gao A, but the person who rang the bell this time was not He Yang, but Lin Sheng who was standing next to him.

Some people sitting in the audience, because they were curious about how fast the players in the field answered the questions, picked up their mobile phones and started recording the time.

When Lin Sheng rang the bell, someone pressed the stop button on the phone while walking, and the time displayed on it was .
After a second, the referee was the first to react, looked at Lin Sheng and said:
"Let's ask Lin Sheng from High A to answer."

As soon as the referee finished speaking, a surprised voice came from the audience: "What!"

Referee: "?" What happened?
The other contestants also looked into the audience, wondering what was going on in the audience.

"It turned out to be ten seconds!"

　Ask for a monthly ticket and ask for a reward (key point) (*/ω＼*)
　　
　
(End of this chapter)