Word is not bad, reward points to how much!

Question 1: 0,1,2,3,4,5,6,7,8,9,
Question 2: 9,8,7,6,5,4,3,2,1,0,
The third question: 0,1,2,3,4,5,6,7,8,9,
Question 4: 9,8,7,6,5,4,3,2,1,0,
It seems that there are only four questions in total. I've been working out all morning. I'm dead

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1. If the sum of all the internal angles of a multilateral row and an external angle is 1000 degrees, then how many degrees is the external angle? How many sides is this row? Another question: the sides Ba and BC of the angle ABC are perpendicular to the sides ed and EF of the angle def, the perpendicular feet are m and N respectively, and the angle ABC = 60 degrees?
2. 8.9.10. 8. If you buy 10 jin eggs at a time, 20% discount is 3 yuan less than 10% discount, then the original price of 10 jin eggs is -------- yuan 9. The ratio of the three integers is 1:2:4, and their sum is 84. Then the largest number among the three integers is () A 56 B 48 C 36 D 12 10. To make a 5-meter-long and 3-meter-wide refrigerator without cover, the cost of box bottom is 60 yuan per square meter, and the cost of box wall per square meter is 2 / 3 of the cost of box bottom per square meter. If the total cost of the whole water tank is 1860 yuan, calculate the height of the water tank
3. If the order of three digits is reversed, the sum of the three digits and the original three digits is 1171, and the three digits can be calculated
4. Mathematics problem of grade one in junior high school: the process of 1 / 60 △ (1 / 4-1 / 5 + 1 / 3)
5. (-3)÷-3÷|1/3-1/2|-(8-11)*2
6. 3/8+2/5+9/11+1/5+2/7+3/5+1/4+4/9+3/7+2/9+5/8=?
7. （11/18+8/9）×2/3×1/2＝
8. There is a two digit number. The number above ten is one half of the number above one. If the number above ten is exchanged with the number above one, the new two digit number will be obtained The number is 36 larger than the original two digit number. Find the two digit number
9. [mathematics of grade one] a two digit number, a on the tenth digit and B on the tenth digit. A new two digit number is obtained by exchanging the numbers on the tenth digit and the single digit A new two digit number is obtained by exchanging ten digit numbers with one digit numbers Try to explain that the sum of the original two digits and the new two digits is a multiple of 11, and the difference is a multiple of 9
10. A two digit number, the sum of one digit number and ten digit number is 6. Exchange these two numbers, and the new number is 18 less than the original number. How much is the original number equal to?
11. It's from Jiangsu People's education press. Next semester. I'm sick and can't catch up
12. 11 and 13 Such as the title
13. Practical questions (1 15:16:8) The ticket price of the quarter finals of 2002 World Cup announced by the Organizing Committee of South Korea is: 300 US dollars for the first-class seats, 200 US dollars for the second-class seats and 125 US dollars for the third-class seats. During the promotion activities, a shopping mall organized 36 award-winning customers to watch the quarter finals of 2002 World Cup in South Korea. After going out for other expenses, it plans to buy two kinds of tickets with 5025 US dollars (all the money is used up), Please design several schemes for the mall to choose, and explain the reasons
14. Mathematics out of form calculation problem (can be simple to calculate) 4.56 + 37 + 4.44 + 47 23 - 8 / 9 × 3 / 8 △ 1 / 27 8.92×7.9+2.1×8.92+28.9 9/10×5/9+4/9×9/10+9/10
15. 1.41.2×8.1+11×9.25+537×0.19 2.55555×666667+44445×666666-155555 3.0.4 × [11 / 52 △ 2 and 3 / 4 × (4.3-1.8)] × 26 4.（2×4×8×16×32）×（25×6.25×1.25×0.25） 5.85.42×7903.29-286.5×790.329+79032.9×4.323 6.1.135+2.246+3.346+4.475+5.557+6.768+7.768+8.979+9.979 7.1/18+1/54+1/108+1/270+1/378+1/504+1/648+1/810+1/990 8.（1+1）/2+（2-1）/2²+（3-1）/2³+… +The 100th power of (100-1) / 2 9.（1-1/2-1/3-… -1/1999）×（1/2+1/3+1/4+… +1/2000）-[（1-1/2-1/3-… -1/2000）（1/2+1/3+… +1/1999）] 10.20-{[（2²+1）/（2²-1）]+[（3²+1）/（3²-1）]+[（4²+1）/（4²-1）]+… +[（20²+1）/（20²-1）]}
16. (simple calculation that can be simplified) (9) 1011 × (3 / 8 +) (10) 130 △ [(34-25) × 821] (11)205×32-656 (12)(20-1.25×0.8)÷1.9
17. Find the first day of Mathematics (Centennial Dictionary) rational number subtraction that chapter of the title, in urgent need! Everyone help Only need the question, not the answer!
18. (- 3.8) - (+ 7) who can do the subtraction of rational numbers?
19. What are the items in the formula 1 / 2-3 / 2-5 / 2-7 / 4?
20. Subtraction of rational numbers in the first year of junior high school: (1) given that the difference between 3 and a number is - 5, find the number. (2) write two negative numbers so that their difference is - 5, write the formula