post middle age

Chapter 148
One night in early March 2019, Wang Xiaoke came to Ren Shuxia's bedroom with a math paper. She pointed to the last additional test question and asked:

"Mom, if you tell me about this problem, I have nowhere to start?"

Ren Shuxia took the paper and looked at it carefully:

"It is known that a linear function has properties: it decreases with the increase of , and the straight line intersects with the straight line at A and D respectively, and point A is in the first quadrant, and the straight line intersects with the axis at B and C respectively.

(1) To make the quadrilateral ABCD a convex quadrilateral, try to find the value range.

(2) It is known that the quadrilateral ABCD is a convex quadrilateral, and the straight line and the axis intersect at E. At that time, find the analytical formula of this linear function.

(3) Under the condition of (2), let the straight line intersect the axis at point F, and prove that D is the circumcenter of . "

"It's a bit complicated," Ren Shuxia muttered.

Then she lowered her head, carefully drew the diagram on the paper according to the meaning of the question, and then spent about 10 minutes to finish answering the question.

I read it carefully again, and then I smiled and explained it patiently to my daughter Wang Xiaoke.

Unfortunately, no matter how she explained, Wang Xiaoke was still at a loss and couldn't figure it out.

Ren Shuxia looked at it, and immediately felt that tutoring children with homework is really not easy.

Wang Xiaoke was also anxious at this time, she glanced at her mother timidly, and muttered softly:
"If only I could take a one-on-one tutoring class, that would be great!"

"What are you talking about, you want to go to a tutoring class!" Ren Shuxia asked happily.

"Hey, forget it, this one-on-one tutoring is too expensive, I heard that one class costs 200 yuan!" Wang Xiaoke sighed softly.

"Ke Ke, you are wrong to think so. As long as you think it is useful to improve your academic performance, mom will enroll you in the class tomorrow. You don't have to worry about how much it costs, as long as you study hard!" Ren Shuxia said with a smile.

"I'm also afraid that the tutoring effect will not be good, and the grades will still not improve. Aren't we wasting money!" Wang Xiaoke looked worried.

"As long as you are willing to study hard, why do you think so much?" Ren Shuxia touched Wang Xiaoke's head and smiled encouragingly.

"Mom, I heard from my classmates that there is a family in our community. The teacher is Teacher Bai. She is a senior teacher. Now she is retired. She has taught junior high school mathematics all her life. She has experience in tutoring students to improve their grades!" Wang said. Xiao Ke said to her mother.

"Well, in the next few months, Mom will enroll you in classes, and we will also participate in one-on-one tutoring. By the way, Ke Ke, if you go to school tomorrow, just ask your classmate and teacher's phone number, and Mom will give you the phone number tomorrow." Contact!" Ren Shuxia replied.

After Wang Xiaoke finished her homework, Ren Shuxia watched her fall asleep peacefully, and then she washed herself. Just as she was lying on the bed, the mobile phone rang quickly. Yes, he called, there must be something urgent, so she quickly connected the phone:
"Shuxia, I'm Zhang Dexin, I'm not asleep yet!" The voice of Zhang Dexin, the deputy general manager of the group company, came immediately from the phone.

"Mr. Zhang, not yet, just about to go to bed, so late, what do you have to do?" Ren Shuxia asked anxiously.

"That's it. The construction period of the Beijing-Zhangjiakou high-speed railway has been set. According to the requirements of the construction unit, it must be put into operation by the end of this year! I also greeted you a few years ago. Comrade Yu Baoqing, the chief engineer of the Beijing-Zhangjiakou high-speed railway headquarters, was originally ill. Not too good, I heard that I fell ill again tonight and was admitted to the hospital, hey, this is also a common disease of middle-aged people, it is a mild cerebral hemorrhage caused by high blood pressure!" Mr. Zhang explained anxiously.

"That's it, I know!" Ren Shuxia seemed to understand the purpose of Mr. Zhang's call. "

"It seems that this year you will be responsible for the technical work of the high-speed rail of the Beijing-Zhangjiakou Sidian Project. In this way, you can go to the hospital tomorrow to see Mr. Yu and see how his condition is, and then prepare to go to the Beijing-Zhangjiakou high-speed rail at any time. ready!" Zhang Dexin said.

"Okay, let me prepare first! Don't worry!" Ren Shuxia replied.

(End of this chapter)