Do they know what his birthday is

The answer should be September 1.

1) First of all, analyze these 10 sets of dates, and it is not difficult to find that there are only two sets of dates, June 7 and December 2.

The number of days is unique. From this, it can be seen that if Xiaoqiang knows that n is 7 or 2, then he must know the teacher.

Birthday. 2) Re-analyze "Xiao Ming said: If I don't know, Xiao Qiang definitely doesn't know", and the 10 sets of dates.

The number of months is 3,6,9,12,And there are more than two sets of dates in the corresponding month,So Xiao Ming learned about m。

It's impossible to know the teacher's birthday.

3) Further analysis of "Xiao Ming said: If I don't know, Xiao Qiang definitely doesn't know", combined with step 2.

Conclusion, it can be seen that Xiaoqiang will never know after learning n.

4) Combining steps 3 and 1, it can be inferred that all the dates of June and December are not the teacher's birthday, because.

If Xiao Ming knows that m is 6, and if Xiao Qiang's n==7, then Xiao Qiang knows the teacher's birthday. (Section.)

Step 1 has been launched), in the same way, if Xiao Ming's m==12, if Xiao Qiang's n==2, then Xiao Qiang can also know the teacher's birthday. That is: m is not equal to 6 and 9. Now all that remains is "March 4th, March 5th, March 8th, September 1st."

September 5 "five sets of dates. And Xiaoqiang knows, so n is not equal to 5 (there are March 5 and September 5), at this time, Xiaoqiang's n (1,4,8) Note: Although there are three possibilities for n at this time, for Xiaoqiang, as long as you know one of them.

One, to draw conclusions. Therefore, there is "Xiaoqiang said: I didn't know it originally, but now I know", and we still need to continue reasoning.

At this point, the rest may be "March 4th, March 8th, September 1st".

5) Analyze "Xiao Ming said: Oh, then I also know", indicating m==9, n==1, (n==5 has been excluded, there are two groups in March).

1.The first sentence excludes June and December, because Xiao Ming is sure that it can't be December 2 or June 7, otherwise Xiao Qiang will know (if he knows by virtue of 2 or 7), so he excludes June and December;

The rest are: March 4th, March 5th, March 8th.

September 1 September 5.

2.Except for June and December, Xiaoqiang immediately confirmed the results, because there are two uncertainties on March 5 and September 5, and the 5th can be ruled out;

The rest are: March 4 and March 8.

September 1 3In the end, Xiao Ming also knew, if it was March, he wouldn't know what day it was. It can be determined that it is September 1.

Step 1: The first sentence shows that the months that Xiao Ming knows are definitely not June and December. Because assuming that Xiao Ming's m value is June, then Xiao Qiang's possible n value is 4 or 7, but when Xiao Qiang's n value is 7, Xiao Qiang can determine which day it is without Xiao Ming telling him the n value (because the n values of the dates December 2 and June 7 are unique among the ten sets of numbers).

When Xiaoqiang knows that n is 2 or 7, he must know that it is that day).

In this way, Xiao Ming couldn't say with certainty: "If I don't know, Xiao Qiang definitely doesn't know either." This contradicts the title.

Therefore, the month that Xiao Ming knows is definitely not June. In the same way, the month that Xiao Ming knows is definitely not December. To sum up, the months that Xiao Ming knows are definitely not June and December.

In this way, Mr. Zhang's birthday can only be generated from (March 4th, March 5th, March 8th, September 1st, and September 5th).

Step 2: The second sentence explains that Xiaoqiang's n value is definitely not 5, that is, Mr. Zhang's birthday m month n day is not March 5 and.

September 5th. Because suppose Xiaoqiang's n-value is 5, that is, Mr. Zhang's birthday m month n day is March 5 or September 5, but then Xiaoqiang can't be sure whether it's March 5 or September 5, Xiaoqiang can't say: "I didn't know it originally, but now I know" This contradicts the title.

Therefore, Xiaoqiang's n-value is definitely not 5, that is, Mr. Zhang's birthday m month n day is not March 5 and September 5. In this way, Mr. Zhang's birthday can only be produced from (March 4, March 8, September 1).

Step 3: The third sentence explains that the month that Xiao Ming knows is definitely not March (i.e., the m value is not 3), that is, Mr. Zhang's birthday m month n day is not March 4 and March 8. Because suppose Xiao Ming's m value is 3, that is, Mr. Zhang's birthday m month n day is March 4 or March 8, but in this way, Xiao Ming can't be sure whether it's March 4 or March 8, Xiao Ming can't say "Oh, then I know too", which contradicts the title.

Therefore, the month that Xiao Ming knows is definitely not March (i.e., the m value is not 3), that is, Mr. Zhang's birthday, m month n, is not March 4 and March 8. In this way, Mr. Zhang's birthday can only be produced from (September 1).

The birthday of Mr. Zhang, who is the first, second, and third steps, is September 1. Proven over!

, Xiao Ming said: If I don't know, Xiao Qiang definitely doesn't know, Xiao Qiang said: I didn't know either, but now I know, Xiao Ming said: Oh, then I also know.

Please deduce what is Mr. Zhang's birthday based on the above dialogue?

Xiao Ming - m (03,06,09,12);

Xiaoqiang – n (1,2,4,5,7,8). Then Mr. Zhang's birthday is (m, n) - m n has duplicates (n has duplicates) - we can determine (m, n) ≠ (06, 7), (m, n) ≠ (12, 2) - m 03, m 09, so the range is set as.

- Because the exclusion of m (06,12) also excludes the same "n" in m (03,09).

From the obtained, Xiaoqiang knows (m in n repeat) (n in m unique) - m, n) (09,1).

Because Xiaoqiang can be sure, it must be - (m,n) (09,1) Therefore, everyone knows that "Mr. Zhang's birthday is (09,1)".

First of all, Xiaoqiang understood. (Xiaoqiang knows for a few days).

Understand that the numbers that Xiao Ming doesn't know are 10, 11, there is a rule, let's think about it, 1+1=2, 2+1=3,。。 11 + 1 = 12 in turn, 12-1 = 11, 11-1 = 10, 10-1 = 9...

So: let's say Xiaoqiang's is the 1st, it can be September 1 or December 1 ——— 2, it can be March, no 2, December, +1, -1 are not related to remove ——— 4, it can be March 4 June ,——

— 5 days, can be June, no 5 days, March ——— 7, can be June 7.

— 8th, can be September, no 8th March——— assuming that Xiao Ming is September, no suitable one, remove.

So the conclusion is December 1st.

Kiss Tong Sui, I am happy to answer for you: birthday is not necessarily the day of birth. Birthdays include people and things.

For people, the eyes are sensitive, birthdays, birthdays, Gu Na Lu's name is the day of birth. But for things, it can only be said that it was born. For example, the party's birthday.

There are also those who are not born or born on this day, but are designated as birthdays on this day. So the answer is no. In the past, most people's birthdays were recorded according to the lunar calendar, but now many people are recorded according to the Common Era.

There are also some people who do not know their date of birth for many reasons, so they set another day as their birthday according to other circumstances. There is also the fact that the commemoration of things does not necessarily coincide with the birth date chosen. Wait a minute.

Hello, you first ask if your parents registered you with the lunar calendar or the solar calendar. For example, my mom registered me with a lunar birthday. If it is a solar calendar, then you have to ask your parents again what your lunar birthday is, and if your parents don't remember your lunar birthday that year, then you can check the perpetual calendar, what is the corresponding lunar calendar under the solar calendar of the year you were born.

If you want to celebrate the birthday of the solar calendar, according to the Chinese method, the solar calendar of each year is changed according to the lunar calendar, for example, I am the lunar calendar of September 24, I have to check the perpetual calendar every year for my birthday, sometimes in October and sometimes in November.

Summary. Hello dear, my birthday is the day I was born. A birthday is the day a person is born and has a special meaning for everyone.

Therefore, everyone has two birthdays, that is, the birthday of the Gregorian calendar and the birthday of the lunar calendar. Chinese celebrate birthdays at different times.

Hello dear, Chang Panchuan's birthday is the day he was born. Birthday is the day of a person's birth, and it has a special meaning for everyone. Therefore, each person has two birthdays, namely the birthday of the Gregorian calendar and the birthday of the lunar calendar.

Chinese celebrate birthdays at different times.

Kissing, generally southerners are calculated according to the Gregorian calendar on the day of birth, northerners are calculated according to the lunar calendar, and there are also Gregorian calendars that are counted as birthdays.

Birthday is not the day of birth.

Dear, yes.

Born on May 27, 2007.

Dear, then you have your birthday on May 27th.