"Cheng, listen up!" Li Muyun crossed one leg and one leg crossed, almost like the storyteller in the West Market, knocked on the table with his hand: "It is said that Xiao Ming's walking speed is twenty miles per hour, and Xiao Ming's dog runs twice as fast as him, on this day Xiao Ming goes to school, his dog runs with him, and every time he runs to his side, he will turn around and run home again, and so on." Q: When Xiao Ming arrived at the school an hour and a half later, how far did his dog run? ”

What is this called a problem? The group of Taixue students below were dumbfounded by the question!

One of them shouted, "Sir, what is your problem, is Xiao Ming crazy or a dog crazy?" What's running back and forth if it's okay? ”

"Lao Tzu is asking you to calculate how many roads the dog runs, not letting you judge whether Xiao Ming is crazy or the dog is crazy or I am crazy! Anyway, this is today's homework, I need to know the answer tomorrow morning, I can't figure it out, this year you have all failed the 'arithmetic'"

The students don't know what it is, but it doesn't sound like a good thing, and it is estimated that it is a failure or something like that, this is the first time that students have experienced what it means to show up and meet soldiers, and it is unreasonable.

Of course, this is also the first time they have encountered a gentleman who would be so domineering in assigning homework, no, it should be said that it is barbaric, if the barbaric teaching method makes it difficult for students to accept.

So immediately after class, some students found Taixue's mountain elder again, denounced Li Muyun's inhumane teaching methods, and hoped that the school could expel him from the teaching team.

But to the disappointment of the students, the mountain chief still didn't say anything, just sent them out with a few perfunctory words, and then began to ponder the question of Xiao Ming and the dog with his head full of gray hair.

As for Li Muyun, who arranged such a perverted homework, he went back to his house in a good way, and he had to go to the construction site to supervise the construction in the afternoon, otherwise God knows what those bastards can build the palace wall of, and if the repair is bad, won't he lose his head.

And just when he was looking at the beauties all over the street and measuring the bust of a group of ladies with his admiring eyes, Mu Yu, the little girl who had been following him, pulled his shirt: "Young master, did Xiao Ming's dog run sixty miles?" ”

"Huh? How did you figure it out? Li Muyun stopped and turned his head in surprise.

"Difficult, is it a miscalculation?" The little girl was a little entangled, stared at by Li Muyun, and was almost about to cry.

Li Muyun suddenly showed a big smile: "That's right, that's right, Xiao Ming walked thirty miles in an hour and a half, so the speed of the puppy was twice as fast as his, so he naturally ran sixty miles." ”

"Am I really right?" The little girl exclaimed with some surprise.

"That's right!" Li Muyun nodded with a straight face.

In fact, this kind of problem can be regarded as a brain teaser at best, as long as the turn comes, it is a very simple multiplication problem.

But if you can't turn that corner, then you're embarrassed, even if you don't know how to estimate it for a lifetime.

However, it was precisely because of this that Li Muyun discovered that the little girl who was following him was so smart that she knew how to consider the problem from the overall situation, which was much better than those students in Taixue.

……

Li Shimin sent Li Muyun to Taixue, so he naturally didn't feel at ease, and it was certain to arrange for people to follow him to inquire about the situation, so not long after someone arrived home, His Majesty the Tang Emperor also received a reply from his subordinates.

"What do you say? Calculate how far a dog has run? What kind of bullshit question is this! After listening to his subordinates' responses, Li Shimin's first reaction was to whip people.

"Back to Your Majesty, Li Muyun is the question!" The subordinates who were sent to Taixue were also entangled, and said in their hearts that this problem was not from me, what are you angry with me, and you want to be angry to find Li Muyun.

"Hmm!" Li Shimin also seemed to realize that he should not be angry with others, so he snorted sullenly and continued: "You just said that Li Muyun was not serious about class? Sleeping in class? ”

"Yes, Your Majesty, the minister thinks that he did it on purpose, and wants to get Taixue to expel him, and then he can justifiably resist the decree."

Of course, Li Shimin knew what a bastard's true thoughts were, waved his hand and said, "You don't need to say this, I know very well, you just need to tell him what he did." ”

"No!" The subordinate replied, thought for a while, and finally shook his head and said, "Your Majesty, there is nothing more, then Li Muyun doesn't seem to have the heart to teach those students at all except sleeping." ”

"Okay, you go down first, and always pay attention to his movements in Taixue." After Li Shimin lowered his head and thought about it, he sent his subordinates out, and then glanced at the eunuchs beside him: "You go and talk to a few princes over ten years old about this question, oh yes, there are a few Changle and them, and let them do the math." ”

"No!" The eunuch turned around in response, but he seemed to be stumbling a little, probably thinking about the result of this question in secret.

As we said earlier, in fact, this is a simple brain teaser, and there is no complication, as long as you grasp the rules, or the brain reacts faster, you can basically answer it immediately.

But people are often limited by their own thinking, and most people will think about how many times the puppy has traveled back and forth between Xiao Ming and Xiao Ming's house after hearing Li Muyun's question, and how far he has traveled each time.

There are even people who wonder if the dog is following him or at home when Xiao Ming starts to walk from home, if he is at home, then he will run one less time, and if he follows Xiao Ming, then he will run more.

And as long as the mind falls into such a strange circle, it will naturally not consider that the time for the puppy to run is actually the same as the time for Xiao Ming to walk, that is, as long as the speed is multiplied by the time.

Of course, according to the ideas of some old pedants, in fact, there are other doubts about Li Muyun's question.

For example, why Xiao Ming's home is so far away from the school, will the dog be eaten halfway, why Xiao Ming must use it, and why is the time so accurate!

Empress Changsun heard this question during lunch, and when she was picking up a pineapple and putting it in her mouth, she just frowned slightly, and said to Li Shimin: "Sixty miles, is this still necessary?" ”

"What? You, how did you figure it out? Li Shimin was so surprised that he almost threw away the chopsticks in his hand.

"Doesn't that count? The puppy takes as much time as Xiao Ming, that is, the puppy also runs for an hour and a half, and you can know if you multiply it according to the speed of the puppy. Empress Eldest Sun glanced at Li Shimin with a strange gaze and said in a slow voice.

"It's that simple?" Li Shimin asked suspiciously.

Empress Eldest Sun nodded: "It's that simple!" ”

(End of chapter)