![](data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" viewBox="0 0 72 71" width="72"></svg>)
In a calendar, the five Sundays in a month are exactly in the same column, and the sum of their dates is 80. In this month, what is the first week of this month
Suppose: the first Sunday is a, then the following four Sundays are a + 7, a + 14, a + 21, a + 28
So a + (a + 7) + (a + 14) + (a + 21) + (a + 28) = 5A + 70 = 80
The solution is a = 2, that is, the first Sunday is 2
There are five Wednesdays in a month, and the sum of their dates is exactly equal to 80. Take the date as a number, for example, 22 as 22, then what day is the 3rd of this month
Use the equation to solve the problem!
The first Wednesday is x, then
X+X+7+X+14+X+21+X+28=80
Solution
X=2
The third is Thursday
How to calculate the calendar date of mathematics homework? For example, today's January 20, 2009 is Wednesday, March 2, 2009 is the day of the week? How to calculate
From January 20 to March 2, there are 13 days. A week is 7 days. 13 divided by 7 is 1. The rest 6. January 20 is Wednesday. The rest 1 indicates that the seven days of a week have passed (a cycle of seven days, for example, today is Wednesday, and the day after another week is also Wednesday). Because of the rest 6, the next 6 days after Wednesday is Tuesday
What day is January 28, 2012? Calendar
Saturday
RELATED INFORMATIONS
- 1. In a month's calendar, the sum of the four days of Thursdays and Fridays in two adjacent lines is 24, so what day is the 1st of this month?
- 2. What day is July 31, 2013?
- 3. Today is July 3, Wednesday. What day is it next month? What day is it next year? Is it solved by binomial theorem? How to calculate
- 4. Today is Sunday, and the 100th day from today is Sunday () A. One B. two C. three D. four
- 5. On May 12 this year, Wenchuan, Sichuan Province, China, experienced an earthquake with a magnitude of 8.0 on the Richter scale
- 6. If today is Friday, April 16, 2004, what day will it be in 100 days
- 7. On July 13, 2001, Beijing won the right to host the 29th Olympic Games. This day is Friday, so July 13 of the year when the 29th Olympic Games were held in Beijing is () A. Thursday B. Friday C. Saturday D. Sunday
- 8. The 30th summer Olympic Games was held in London in 2012. The climate type of London is () A. ①B. ②C. ③D. ④
- 9. September 1st, 2002 is Sunday. What day is September 1st, 2003?
- 10. If October happens to have four Sundays, what day is October 31?
- 11. I found that there are four Sundays in August on my calendar. What day is August 1st?
- 12. There are even dates on three Sundays in a month. What day is the 16th of this month?
- 13. If there are even dates on 3 Sundays in a month, then the 5th of this month is______ ．
- 14. New year's Day is Monday. What day is the national day of the same year? What day is the new year's day of the second year? The faster the formula, the better
- 15. The new year's day of 2008 is Tuesday. Q: after 2008, 2008 What day is the day of 2008?
- 16. New year's day in 2013 is Tuesday. What day is it after 2010?
- 17. It is known that July 1, 2002 is Monday, and October 1, 2015 is the day of the week
- 18. It is known that the arithmetic sequence an satisfies A2 = 2, A5 = 8, 1. Find the general term formula 2 of the sequence an. Let the sum of the first n terms of the arithmetic sequence BN with all positive numbers be TN. if B3 = A3, T3 = 7, find TN
- 19. Today is Tuesday. After 2007, what day is it
- 20. There are five Mondays in June, but only four Tuesdays. What day is the first day of the month? Come on, it's coming, If you can: to calculate If there is no formula, why