Explanation:
(1) According to the meaning of the question, b= 3
Eccentricity e=(under the square root (a square-b square))/a=1/2, so a=2
So the equation of the oval is x squared/4 y squared/3=1
(2)Set…
……
When the word "solution" was written, there was no turning back.
Xu Heng's answer was like flowing water.
Yao Ruiyi couldn't even keep up.
He wrote too fast!
Regardless of whether it was correct or not, she could no longer understand it!
What was known and what was the vertical theorem? In the end, Xu Heng gave the final answer.
It had only been five minutes!
He was simply not human!
Yao Ruiyi invited another invigilator to the side." Teacher, if it were you, would you be able to do it so quickly?”
He immediately shook his head." You must be joking!”
"Looking at him do the questions, he basically knows them by heart! Give the correct answer after reading the question! Hiss…this is too terrifying."
Yao Ruiyi frowned." The correct answer?”
"Oh, I forgot to tell you. I teach third-year math!”
Yao Ruiyi was speechless.
Yao Ruiyi said," So, what he did was right?!”
Not only was it fast!
And it was correct!
The invigilator nodded solemnly.
F * ck!
What the f * ck!
Yao Ruiyi was a lady, but no matter how ladylike she was, she couldn't find any words to describe her shock.
"He really isn't human!"
This invigilator said," Teacher Yao, don't say that! Aren't you scolding me?"
"I…this…"
The two of them returned to Xu Heng's side and looked down.
Xu Heng was already working on the next question.
This was a picture question.
There was proof, and there was also proof of the value of the sines.
After Xu Heng proved it, he began to calculate the sine-value of the plane angle required by the question.
Swoosh! Swoosh! Swoosh!
Finished writing!
He looked up at the timetable hanging on the wall.
Slightly stunned, he muttered," Why does time pass so slowly?”
Slow!
It was clearly you who did it too fast!
Yao Ruiyi couldn't help but complain.
Xu Heng lowered his head and looked at the question." Hiss…"
He gasped.
Yao Ruiyi's first reaction was," Wrong?”
However, before she could react, Xu Heng slowly wrote three words in the blank space of the question,"Method 2"!
Method 2!
You actually have an algorithm!
Be a human!
Please be a human!
Other people don't even have enough time for the exam, yet you're still thinking about studying the second algorithm!
The invigilator who taught third-year math had his eyes bulging out.
He looked at Xu Heng's method 2 and his head buzzed.
These were two completely different solutions!
The poles apart!
However, the final answer was the same.
He carefully compared these two solutions and found that they were both correct!
All correct!
！！！
This student was too awesome!
He was undoubtedly a genius!
He should be guaranteed a spot!
He shouldn't be buried in our Spruce High School!
He stared at the name on the paper.
Xu Heng!
His name was Xu Heng!
Class 3 of the second year!
I'll remember it!
I'll remember this student. Oh, no, I'll remember this study god!
After Xu Heng finished writing the two solutions, he flipped through the test paper.
"Whoa…"
It was a strange auxiliary word.
At the same time, a gratified expression appeared on his face.
Yao Ruiyi was confused."???”
Xu Heng muttered to himself," Fortunately, there's still one more question. I won't have to wait for more than an hour to hand in the paper in advance."”
Puchi--
Xu Heng's words were like a deep-water torpedoes, exploding on the spot!
The hearts of Yao Ruiyi and the other invigilator were in turmoil!
They didn't dare to look at Xu Heng anymore.
They left quietly and looked at the other students.
All of them were either scratching their heads or biting the end of their pens, racking their brains to think about how to solve the questions.
But they had just completed the first proof question!
There were even more difficult things to come!
A piece of parchment!
Two pieces of paper!
Three pieces of paper!
They all used three pieces of parchment!
Anyway, the noodles were full!
"This…"
It wasn't that the two invigilators looked down on him, but that Xu Heng was too cruel!
Yao Ruiyi looked at the first place student in the language class next door. Her math was not bad either. She was in the top three of the class, but she had only completed half of the paper.
The script was also written densely on the papyrus.
Yao Ruiyi shook her head.
She had seen how terrifying Xu Heng was. When she looked at the other students, she felt that they were all bad students.
She was not interested even in this person who had good grades.
Yao Ruiyi felt that Xu Heng's answers were more interesting.
It was like watching TV. There would be an advertisement every now and then. Moreover, it was a boring variety show. Who would watch it?
Anyway, there was no such thing as an ad-free, exciting blockbuster that attracted people!
There was simply no comparison!
Xu Heng's answers were like a gorgeous visual feast!
"Sigh…"
Yao Ruiyi sighed and turned to leave.
The student's heart skipped a beat.
What the hell?
Why is this teacher sighing in front of me?
Could it be that I did the previous question wrong?
This, this, this…
She did not understand!
She felt that she had already exceeded her usual performance!
She was clearly doing it very smoothly!
His mentality was a little broken.
He raised his head and looked at Yao Ruiyi. Yao Ruiyi walked up to Xu Heng and couldn't help but smile.
But the next second, she noticed that Yao Ruiyi's eyes widened and she was stunned.
What was going on?
Following Yao Ruiyi's shocked gaze, she saw Xu Heng.
At this moment, Xu Heng put down his pen and put away his test papers.
Although she couldn't see what he wrote on the paper, it was clearly very neat and densely packed.
But why was his papyrus so white and flawless?!
Under the sunlight!
It was so white that it reflected light!
It was so dazzling!
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