"Look! As soon as I use the formula to make this problem, I will win, and a certain fat man will have to confess. Isn't this the formula that proves confession? ”

Zhang Song smiled disdainfully: "I thought you could name a flower!" Come, let me use the formula to prove that it should be the girl who confesses first. ”

"What?" Lan Ruosi was stunned.

Lan Ruosi felt that among the four of them, her results were the best.

The formula is used to do the question, how can it be proved that the girl confesses first.

She's a real insight.

"Tell me how to prove it with a formula, and the girl will confess first."

Gu Xu was also puzzled, he thought about it for a long time, but he didn't understand how to prove it.

"Look, there is a saying that women come first, men step aside, and have you ever learned Chinese class, so girls confess first."

"Poof!" Lan Ruosi smiled.

Gu Xu gave a thumbs up: "You are strong!" ”

"You're a fallacy!" Lan Ruosi said, "What kind of formula is this! I thought you could come up with that kind of proof question......"

Jia Fan was really disdainful: "You can prove it like this, then I can also prove that it should be the boy who confesses first."

You are optimistic, there are 26 letters in English, boys are BOY, girls are GIRL, and B is in front of G, so boys confess first. ”

When Zhang Song heard this, he was stupid, "Can it still be like this?" ”

"Hurry up, confess!"

"Wait, I have another theorem to prove who confesses first, Archimedes' buoyancy theorem proves that water is buoyant, women are water, and water will float up, so, women confess first!"

Lan Ruosi shook his head: "You guys are all crooked, and they don't make sense. ”

"Then you name one!" Jia Fanzhen and Zhang Song spoke in unison.

Lan Ruosi was surprised: "When did the two of you have such a tacit understanding." ”

Gu Xu was also surprised: "Is there a lot of quarrels, there is a tacit understanding." ”

Zhang Song said: "I want to see how Xueba proves it with a formula. ”

Gu Xu immediately protected his wife: "She didn't say that she would prove it with a formula, she just refuted you." ”

Zhang Song smiled contemptuously: "Ouch, this hasn't entered the door yet, and it's become a wife protector." ”

Lan Ruosi lowered her head, and her face turned red.

Gu Xu glared at him: "Don't talk nonsense. ”

Lan Ruosi pursed her lips and smiled, she also felt that Gu Xu took special care of her.

Maybe it's because of the special period, Gu Xu is always worried about her body and her emotions.

She had an idea: "Come on, I'll prove it with a mathematical formula."

You are my condition.

Without you, I can't be pushed. Without me, I can't push you.

Therefore, we are dependent on each other!

You are my defining domain.

Without you, the existence of my functions is meaningless.

Without you, my life would always be an empty set.

So, I ......"

Lan Ruosi almost said, I love you!

But when the words came to her mouth, her face turned red, and she still couldn't speak.

Zhang Song and Jia Fanzhen glanced at each other.

Jia Fanzhen said: "Fatty, you have listened for a long time, do you understand, whether it is a boy's confession or a girl's confession." ”

Zhang Song was also confused: "I don't understand, who confessed first!" ”

Gu Xu secretly snickered, who confessed first, she had already confessed!

He felt that today's meal was really worth it!

It was the happiest meal of his life.

Gu Xu said again: "You two have poor grades, you don't understand normal!" ”

Lan Ruosi also smiled when she heard it: "Yes, you have poor grades!" ”

"Yo he!" Zhang Song's voice rose, "These are the two with good grades and those with bad grades?" ”

"Nope!" Lan Ruosi said, "Gu Xu, I suddenly remembered, how did you do this question, let's go back to the classroom, I'll do it for you." ”

"Really? So smart! Gu Xu had no accidents, this was the normal level of his little daughter-in-law.

Lan Ruosi smiled: "Let's go back!" ”

Gu Xu nodded.

The two of them stood up as they spoke.

Jia Fanzhen said: "That's it, I haven't finished eating yet!" ”

Zhang Song replied: "Every time you eat, you are the slowest, you are right." Everyone else is eating, and you're talking here.

Don't eat it, you won't have a brain just by eating. ”

"That's better than your pig brain." Before Jia Fan finished speaking, he saw Zhang Song get up.

She hurriedly said, "Fatty, you can go too, don't wait for me!" ”

"It's said that you don't have a brain just by eating, and the two top students want to analyze the questions, so we can't hurry up and steal the school! You don't starve to death if you eat a few bites! Zhang Song said, put away Jia Fanzhen's dinner plate together, and take a walk!

Jia Fanzhen said: "Fatty, your grades have risen so fast, have you stolen a lot of learning!" ”

"Nonsense! If I don't steal from school, they don't have enough time to fall in love, and they still have to study, so how can they have time to teach me alone. ”

Lan Ruosi and Gu Xu said as they walked, and Zhang Song and Jia Fanzhen also followed.

They came to the classroom.

Lan Ruosi walked directly in the direction of Zhang Song and Jia Fanzhen's desks.

She took out a piece of scratch paper and said while writing the question silently: "This kind of question, if it is a multiple-choice question, is of medium difficulty, after all, there are four answers, and you can directly bring the answers in."

It's better if it's a fill-in-the-blank question, but it's not too difficult. Just fill in the blanks!

If it is a question to be answered, it will be a bit of a delay, and a solution process is required. The full score for the general answer question is 16 points, and this type of question can be used as a solution question to pull away the score. Good students can do it completely, and they can get full marks. The average student only needs to write out the analysis process, and he will get a few points for a few steps. ”

Jia Fanzhen looked at Lan Ruosi and was surprised: "My little Sisi is really a god, while talking, he can also write the question silently." But, Xiao Sisi, why don't you use my paper? ”

"Your piece of paper is full of words, and it's all wrong, and it affects my thinking. I'm going to start doing it now! ”

Lan Ruosi began to work on the topic on the scratch paper.

"Bag A contains two $10 bills and three $1 notes, and bag B contains four $5 notes and three $1 notes. Two banknotes were randomly taken out of each of the two bags. What is the probability that the sum of the remaining denominations in A is greater than the sum of the remaining denominations in B?

Hypothesis: The total denomination of two banknotes taken from A is a, and the total denomination of two banknotes taken from B is b. If A is less than B, then the sum of the remaining denominations of A is greater than the sum of the remaining denominations of B.

Step 1: A method of taking meets the requirements, which is equivalent to the total face value of the two banknotes taken from A A is less than the total face value of the two banknotes taken from B b, so that only two 1 yuan banknotes can be taken from A, and the corresponding number of methods is C2 3 = 3, and there are 3 combinations of two from the three.

Step 2: That is, the two banknotes taken from B cannot both be 1 yuan banknotes, and there is a corresponding way to take C2 7 minus C2 3, which is 18 ways to take it.

Therefore, the probability sought is 3*18 divided by C2 5C2 7 equals 54 divided by 10*21.

Answer: 9/35. ”

She breathed a sigh of relief after doing it: "Actually, it's not difficult to say!" It's just a bit of a twist! ”

After she finished speaking, she looked up at Gu Xu, full of expectation: "Is the answer correct?" ”