After school that afternoon, Yang Lezhen and Wu Shumei walked to the school cafeteria together.

"I really don't understand today's math lesson!" Wu Shumei said as she walked.

Yang Lezhen also sighed and said: I thought that high school mathematics would be easier to understand than junior high school mathematics, but in today's mathematics class, I also understand that high school is more difficult. ”

They walked under a large tree and found a test paper.

"Huh? Whose math paper is this? Yang Lezhen asked herself while bending down to pick it up.

"Look at it head-on! There is a name written on the front. ”

"The sixteenth class of high school Wang Chuyue? This is the exam paper of a student in Class 16! Yang Lezhen told Wu Shumei.

"Let's go back now!" Wu Shumei suggested.

"Okay."

Just as they were about to turn around and head back to the school building, a girl approached them.

"Hello!" The girl greeted them.

"Hello! Who are you? Yang Lezhen also politely said hello.

The girl pointed to the test paper in Yang Lezhen's hand and asked anxiously, "I want to know, is the test paper in your hand yours?" ”

"It's not mine, we're about to return this test paper to a student named Wang Chuyue, this test paper is hers."

"I am Wang Chuyue! This paper should be mine. ”

Yang Lezhen immediately returned the test paper to her.

"Thank you!" She was very happy when she got her exam paper back.

Wu Shumei saw the name of the thick book she was holding, "The Complete Set of Mathematics Training for the College Entrance Examination". Curiously asked, "Are you a senior in high school?"

"That's right!" The girl replied with a smile.

"This is a test paper I did when I was a freshman in high school, and this test paper is full of notes." Wang Chuyue unfolded the test paper and showed it to them.

"Oh my God, this is what we learned in math class today, and I didn't understand it." Wu Shumei said in surprise.

"Didn't you understand? Then when you're done with dinner, you come to me, and I think I can tell you about it. ”

"Okay, thank you," Wu Shumei said excitedly.

It was already dark, and it was already six twenty o'clock, so they hurried to dinner, because there was still the ninth class at seven o'clock, and they had to be in the classroom at 6:50, and they could only ask the senior sister about math, only 10 minutes.

After dinner, it was 6:31 a.m.

The two of them came to the place they had just agreed with their senior sister.

"You're here!"

"Hmm." Yang Lezhen turned his head and saw that Wang Chuyue was still waiting for them under the big tree.

Wang Chuyue took a workbook for the first year of high school and flipped to the third unit. This unit is the most difficult and difficult unit to learn in the first semester of the first year of high school, and she also asked some seniors for advice at that time to understand, so this time she took the initiative to help these two students.

"Hello, senior sister, my name is Yang Lezhen, and I am now a freshman in high school."

"I'm Wu Shumei."

"Haha, it's nice to meet two elementary school girls who are willing to ask for advice." Wang Chuyue said while flipping through the book.

"The exponential function is really difficult, I'll teach you again today, you go back and think about how to do these problems yourself, and then tomorrow you will show your math teacher these problems you did yourself!" Wang Chuyue said.

Yang Lezhen and Wu Shumei listened very seriously, and sometimes told jokes with Wang Chuyue.

After class, they hurriedly ran back to the classroom, and on the way, Wu Shumei asked while panting: "I hope this time I can add points to the class."

"No, it's the senior sister's class that adds points, she takes the initiative to teach us, not to ask her for advice."

"Hurry up, we'd better go back to the classroom before the bell rings." Yang Lezhen said as she ran, her forehead covered with sweat.