(Thank you for the reward of a dream that shocked the immortals in Shu)

This question went through Cheng Mo's mind, and he immediately came up with the answer - no.

This is a less complicated reasoning question, and the so-called new moon is the moon of the first day of the new month. In astronomical terms, the crescent moon is the ecliptic longitude of the moon and the sun (the ecliptic longitude of the sun refers to the earth's orbit around the sun). The phase of the moon at the same time, i.e., the moon, the sun, and the earth are in the same straight line. That is, when the Moon is in the middle (assuming the Sun is on the left and the Earth is on the right) and blocks the light cast by the Sun more (when the three spheres are roughly one line), the Moon is seen by a person in the hemisphere facing away from the Sun.

During the new moon, the front of the moon is exactly facing the sun, and the dark hemisphere of the moon is facing the earth, so the moon is not visible from the earth.

So, you can't see the crescent moon at midnight, and the crescent moon can only be seen at dawn or evening, but the polar regions are an exception, where you can see the crescent moon 24 hours a day, and if he is really a U.S. citizen, then he must be living in Alaska, close to the Arctic Circle or even further north.

And in 1932, when Franklin Delano Roosevelt was elected, the citizens of the Alaska region did not have the right to elect president, so he did not vote for Roosevelt, regardless of his position.

Cheng Mo launched the answer in an instant, this question is too simple for him with a lot of knowledge, but he glanced at the actor Du Leng who was still thinking, so he could only keep silent, this kind of thing to steal the limelight of the actor is absolutely not something that can be done.

Yan Yitong glanced at Cheng Mo, who was expressionless, and said with a smile: "Don't say you can't answer such a simple question?"

Cheng Mo sneered and pretended to be thinking and said, "The answer is nothing more than the new moon..... I'm just wondering if there is a cross on top of the Dome of the Rock....."

Hearing Cheng Mo say the word "new moon", Xie Minyun, who was meditating, suddenly realized.

At this time, Du Leng coughed and said, "There should be no ....."

Yan Yitong looked at Du Leng and said, "Why?"

Du said coldly: "1, the first Monday after November of the presidential election year is the day of the U.S. presidential election; 2, during this time, only the polar regions can see the new moon 24 hours a day; 3, in 1932, the citizens of Alaska did not have the right to elect the president......"

"Bingo!" Yan Yitong snapped her fingers, and then she looked at Cheng Mo and said, "Yo!

Cheng Xiao immediately applauded: "Du Leng, you are so powerful!"

Cheng Mo pretended to look at Du Leng with disdain and said, "Aren't I analyzing? Someone preemptively said what I can do, I must have answered this question.....

Yan Yitong sneered: "The dead duck has a hard mouth, then I'll ask the second question...... Listen! A-kun is thinking of a number between 99 and 999. Mr. B asked Mr. A if the number was lower than 500, and Mr. A replied "yes"; When asked if the number was a square number, Mr. A replied "yes", and when asked if the number was a cubic number, Mr. A replied "yes". However, only two of the three results answered by Mr. A are correct. But Mr. A later honestly told Mr. B that the first and last digits of the number were 5, 7, or 9. ”

"What is that number, please?"

Cheng Mo listened to the question and got the answer after thinking about it for a while, Jun A said that the number below 500 was obviously a lie, because the first number, whether it is a three-digit number of 5, 7 or 9, is greater than 500. The number of perfect squares and the number of perfect cubes are very small in this range and can be enumerated. Two numbers are obtained, and the result can be found according to the last condition - 729.

After Cheng Mo calculated the answer, he went to see the actor Du Leng, but he seemed to be still thinking about it, Cheng Mo said in his heart: How should I prompt this question?

So he could only pretend to think, and boredly used his hand to calculate, and then Xie Minyun turned his gaze to Cheng Mo's hand that was making strokes, looked at it twice, and said: "The answer is 729"

Yan Yitong snapped his fingers again and said with a smile on his face: "Bingo!" and then said: "Senior Sister Min Yun is still good at math.....!

Xie Minyun said: "Actually, I'm really not good at math, especially mental arithmetic....."

Du Leng, who was sweating all over his head, smiled and said, "Is this still not good at mathematics?" Min Yun is too modest!" Mathematics has always been Du Leng's weakness.

Yan Yitong glanced at Cheng Mo again, and said with a grin: "Great talent, you don't want to say that you are good at liberal arts, not science, right?"

Cheng Mo spread out his hands and once again said with an expression of forcible non-defeat on his face: "I also calculated that it was 729..... It's just that I'm not sure of the answer, so I verified it again with a hand algorithm, so it's just a little late....."

Yan Yitong sneered and said, "Hehe.......! Then Senior Sister Min Yun and Senior Du are not allowed to answer this question, see if this kid doesn't answer....."

Du Leng and Xie Minyun both glanced at Cheng Mo and nodded.

Yan Yitong deliberately showed a high-spirited appearance and said to Cheng Mo: "You will answer this question alone..... If you can't answer, you have to promise me to be my follower today!"

Cheng Mo speculated that she should not be able to stump herself based on Yan Yitong's two questions, so she said lightly: "If you answer, please don't harass me....."

Yan Yitong smiled mysteriously: "Okay! No problem! The problem is like this-one day the math teacher called Xiao A and Xiao B, who had good math scores, to the office, and the math teacher selected two different integers from 2 to 99, and told Xiao A the sum and the product to Xiao B. Xiao Adao: Although I don't know what these two numbers are, I know that you don't know what these two numbers are. Little B: I didn't know, but if you say that, I will know. Little A said: Oh! Then I know!"

"Now tell me, which are the two numbers that the math teacher picked out, and why?"

Yan Yitong finished the question, Cheng Xiao looked confused, she felt that this question was really a bit nonsensical, and Du Leng was glad that this question was only answered by Cheng Mo, he had no clue about this question at all, and Xie Minyun frowned and entered the long exam, if there is paper and pen, this question is much easier to calculate, but only relying on mental arithmetic, the difficulty is undoubtedly increased geometrically.

After listening to this question, Cheng Mo said expressionlessly: "Can you change the question? It's a little unfair for you to come up with this question!"

Yan Yitong said triumphantly: "That's it! You can't answer this question, and you can't answer the rest of it!"

Cheng Mo stopped answering and began to calculate, the reason why he said it was unfair was because he knew the answer by listening to the question, this problem is called "The Impossible Puzzle" is a purely mathematical problem, at first glance it seems that there are no clues, it cannot be answered, so it is called "impossible puzzle".

There are many versions of this puzzle, and Yan Yitong is the simplest and original version of the puzzle, but people who are not interested in mathematics will never know that this problem was published by Hans Frydenthal in 1969.

At this moment, Cheng Mo came up with four solutions to the problem: the first one is more complicated, assuming that the number is X,Y, and the sum is X+Y=A, and the product is X*Y=B. According to the conversation between the two, it can be seen that X+Y is not the sum of two prime numbers, so the possibility of A is 11, 17, 23......

After about three minutes of calculation, Cheng Mo calculated that the two numbers were 4 and 13, but when he saw Du Leng's confused face, Xie Minyun was still frowning and obviously still calculating, Cheng Mo could only twitch the corners of his mouth again..... Obviously, he calculated too quickly, so he could only push the question again with the simplest Goldbach conjecture, and the answer was the same.

When Yan Yitong asked impatiently: "Do you count it out?" You really can't guess two to try your luck! You can't tell me to keep waiting, right?"

Cheng Mo raised his head and looked at Yan Yitong, pretending to be uncertain and said, "It should be 4 and 13, I don't know if I guessed right?"

(Today is still only one more, because it is expected to end the old book yesterday and make every effort to update the new book, but the old book still has a chapter to write today, so it can only be more one chapter today, but from the day after tomorrow, a chapter will be updated at about two o'clock at noon every day, and a chapter will be updated at about nine o'clock in the evening, and the pigeons will not be released.) ）