In 2012, the number of days with excellent air quality in our city accounted for 3% of the whole year. How many days with excellent air quality in 2012 Two minutes to answer

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• 1. Mr. Zhang's salary in December last year was 3000 yuan. After deducting 2000 yuan, he paid personal income tax according to the standard on the right. Mr. Zhang should pay personal income tax in December______ Yuan
• 2. There are two kinds of pens, a and B. their price ratio is 2:1. If the price is reduced by 5 yuan, their price ratio is 9:2. What are the original prices of these two kinds of pens?
• 3. We only need to use fraction four mixed operations A bookshelf has two layers, the upper and the lower, with a total of 128 books. The ratio of the number of books on the upper and the lower layers is 5:3. How many more books are there on the upper layer than on the lower layer? (mixed operation with four fractions.) Here's how it works 5+3=8 Upper layer: 128 / 8 * 5 = 80 (this) Lower layer: 128 / 8 * 3 = 48 (this) 80-48 = 32
• 4. Pave a 2-meter-wide path around a 37.68-meter-long circular pool. How many square meters is the area of the path?
• 5. There are three digital cards of 0.35, which make up a three digit number. What is the percentage of 0 at the end?
• 6. One fifth of the students in class 6 (1) participated in the cleaning, and then two students took the initiative to participate in the cleaning One fifth of the original students in class 6 (1) participated in the cleaning, and then two students took the initiative to participate. The actual number of participants was one-third of the number who did not. How many students participated in the cleaning?
• 7. The sixth grade Mathematical Olympiad questions and answers 100
• 8. Primary school sixth grade mathematics problem 100, urgent
• 9. Young pioneers participated in the exhibition of environmental protection. 120 people went to the exhibition on the first day, 30 less than 1.5 times the number on the second day. How many people went to the exhibition on the second day?
• 10. In sunny days, it takes 12 days for team a to complete the task, and 15 days for team B to complete the task. In rainy days, the work efficiency of team a will decrease by 50%, and that of team B will decrease by 25%. In the last two construction teams to start and complete the two projects at the same time, there will be more difficulties in rainy days_____ Day two One by one, one answer, two answers, two answers, three answers,
• 11. I don't know how many days there are in the first half of a leap year?
• 12. P is the point on the right branch of hyperbola x29-y216 = 1, m and N are the points on the circle (x + 5) 2 + y2 = 4 and (X-5) 2 + y2 = 1 respectively, then the maximum value of | PM | - | PN | is () A. 6B. 7C. 8D. 9
• 13. Circle (x-1) ^ 2 + (Y-1) ^ 2 = 9, through a (2,3) as any chord of the circle, find the trajectory equation of the midpoint P of these chords No pictures,
• 14. As shown in the figure, in the plane rectangular coordinate system, the endpoint coordinates of line AB are a (- 2,4), B (4,2), and the line y = kx-2 has an intersection with line AB, then the value of K cannot be () A. -5B. -2C. 3D. 5
• 15. How to draw the image of parameter equation x = 1-T ^ 2, y = t - ^ 3?
• 16. It is known that the equation of a circle is (x-1) 2 + y2 = 4. A point a (4,2) (1) outside the circle solves the tangent equation of the circle passing through point a
• 17. If there is a common point between the line L passing through point a (4,0) and the curve (X-2) 2 + y2 = 1, the range of the slope of the line L is () A. [−3，3]B. (−3，3)C. [−33，33]D. (−33，33)
• 18. In the triangle ABC, the opposite sides of angles a, B and C are a, B and C respectively. We know that a = 2, C = 3 and CoSb = 1 / 4
• 19. If P and Q are on the line AB, AP: Pb = 2:3, AQ: QB = 3:4, and PQ = 3, the length of AB is obtained
• 20. On the practical significance of Maslow's hierarchy of needs theory in the practice of enterprise management