Grandfather:

Answer=》

Why do you look like a little daughter-in-law all day long, where is my handsome and dashing and suave school grass boyfriend?

Why don't you hurry up and give me back my Qi Yi.

In other words, you are agitating and circling in circles, is it interesting to force people to say those words to you?

Since you will only say like, not love, then why did you give me a love equation when you left?

17·x^2-16|x|y+17y^2=225, I have solved it.

The heart you gave me is not at all like Descartes' butt-shaped heart, it's a very standard heart. (Note 1)

When I first started solving the problem, I used a blue pen to draw on the coordinate axis.

When I was done, I took a new piece of paper, drew it with a red pen, and filled the middle of the curve with red paint.

I took a photo, and a "sparkling red heart" is waiting for you in the attachment.

The equation represents your heart, and the attachment represents mine.

Question=》

Today is the thirtieth year of the Chinese New Year's Eve, how are you doing in Wenzhou?

…………………………

During the Chinese New Year, in the winter of the Northern Hemisphere, Melbourne implements daylight saving time, which has a three-hour time difference with China.

By the time 12 o'clock in Melbourne was already the first day of the new year, the domestic time was only 9 o'clock in the evening of the Chinese New Year's Eve.

Yan Yun just drew Qi Yi's "sparkling red heart" in his sketchbook.

Sketching is the basic skill of all design, and if Yan Yun did not have a good sketching foundation, he would not have been recognized as soon as he arrived at the School of Architectural Design of the University of Melbourne and started his sophomore year.

Yan Dabang likes technology, and in the era when he started his business, there were no computers that could be used to make drawings, and Yan Dabang often drew a lot of drawings of parts and machinery by hand.

Yan Yun has been learning from all kinds, and since he was a child, he likes to scribble and draw on paper.

When Yan Yun was very young, he began to sketch a little untaught.

If it weren't for the fact that she still had a painting companion, since elementary school, she had no friends and was targeted by her classmates, which would definitely make Yan Yun even more sad.

After sketching for more than ten years, Yan Yun now rarely uses a sketch pen to paint, but likes to use a pen, to put it professionally, he likes to use a needle pen to sketch.

The disadvantage of pen sketching is that there is no way to iterate on what you are not satisfied with as you would with a tool such as a pencil or charcoal.

The advantage of pen sketching is that it is more decisive and easier to preserve.

Yan Yun's architectural pen drawings were praised by many professors when he was at the University of Moxi.

Other students' architectural pen drawings usually use A4-sized paper, but Yan Yun especially likes to use A3.

In addition to the solid basic skills, the speed of Yan Yun's pen sketching is also quite outstanding.

The paper that Yan Yun had just used to solve the equation that Qi Yi had given her was also an A3-sized sketch paper.

A small red heart in the analytic geometric coordinates, sitting in the center of a large sketch paper, looks small and lonely.

The thirtieth year of the Chinese New Year's Eve cannot be without a special expression.

Yan Yun thought about it, and drew a short-legged tiger with big eyes and cute in the upper left corner of the sketch paper.

After the drawing, I drew a vivid squid in the lower right corner of the sketch paper.

Qi Yi has such a high IQ, he must be able to understand what the short-legged tiger and squid represent.

Yan Yun was very satisfied with scanning his "work", uploaded the attachment, and sent it to Qi Yi along with the email he had just written.

After sending the email, Yan Yun looked at the time, it was just nine o'clock in the evening in Melbourne.

At six o'clock in the evening in China, Qi Yi's family's Chinese New Year's Eve dinner must not have been finished, and Yan Yun felt that Qi Yi must not be able to return the email soon.

Yan Yun turned a new page in her sketchbook and continued her favorite architectural pen drawings.

She suddenly wanted to draw the high school campus in her memory.

Every grass and tree on campus is in Yan Yun's memory.

Yan Yun remembered every building in the school, as well as the school motto written by Mr. Zhu Ziqing when he was teaching in 1923, "Yingqi Kuangguo, be a holy enlightenment".

It's just that before she and Qi Yi got back together this time, Yan Yun didn't want to let herself think of the place where she and Qi Yi met.

If you don't graduate, you don't know what your alma mater is.

In fact, most of a person's feelings for school have nothing to do with learning.

It's mostly because of the people in the school and what has happened on campus.

A school that only has memories of going to school usually doesn't make people have much nostalgia.

Yan Yun was painting the campus buildings of the high school at the beginning, and as he painted, he added two people walking side by side on the school's playground.

Then two more people were added who were leaning against the railing outside the classroom and chatting.

After that, it was the handsome flag-raiser under the national flag stand, and the flag-bearer who looked at the flag-raiser affectionately and forgot where the flag was.

Such an unserious, unserious architectural pen drawing, Yan Yun is the first time to paint.

Yan Yun drew for more than two hours, but the computer never sent a reminder of receiving an email.

In the past few days, Qi Yidu will reply to the email as soon as he receives it.

Today is probably busy with the Chinese New Year, and I haven't had time to sit down in front of the computer.

waited until it was twelve o'clock in the night in Melbourne, and when Yan Yun was about to go to bed, he didn't receive a reply from Qi Yi.

Yan Yun decided not to wait for it to continue, and it was normal for him to not be idle so early in the thirtieth year of the Chinese New Year's Eve.

If you wait any longer, I don't know how long you will have to wait, anyway, when you wake up tomorrow, Qi Yi will definitely have written back to him.

On the first day of the Lunar New Year, the first day of the Year of the Rabbit, Yan Yun didn't know what Qi Yi would say to her in the email.

It should be said that in the second year of high school, the two of them, in the Chinese New Year's Eve, ran to the library to stay until the people closed before returning home.

Yan Yun shook her head, she and Qi Yi back then really had a "deep love" for the library.

…………………………

Note 1:

^This symbol here means power.

In fact, Qi Yi could have sent a higher-order three-dimensional three-dimensional "heart" to Yan Yun.

However, first, Yan Yun, who is not a math major, may not be able to solve such complex equations.

Second, although the writing software of China Literature can already display spaces between English words, it still cannot display mathematical formulas.

There is no way to even square an X, so you can only use x^2 instead.

Don't even think about the higher-order equations with root numbers.

Are there any readers in the math department?

Why don't you try to solve the equation that is relatively simple but very beautiful three-dimensional hearts?

(x^2 +(9/4)y^2 + z^2 – 1)^3 – x^2z^3 –(9/80)y^2z^3 = 0

If you are not from the Department of Mathematics, let Xiaomo not play, after all, it is already a very difficult thing to write clearly what this equation should look like.

What's more, it is necessary to use the Eulers Transformation (Euler Transformation) to set up the spatial Cartesian axes.

If you fall in love with ordinary people, don't write this kind of equation, so as not to be dumped directly.