3.76°=______ Degree______ Points______ Seconds

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• 1. A simple algorithm for dividing 6237 by 63 You have to say why,
• 2. 1+2-3-4+5+6.-1983-1984+1985+1986=? Simple algorithm to solve, time is very tight!
• 3. 11.. 1 (2000 1) 55.. 5 (2000 5) divided by 333.. 3 (1999 3) 5 What is the value of?
• 4. What is 5 out of 18 - (5 out of 18-7 out of 25)?
• 5. Record of water freezing experiment at what temperature
• 6. And those words mean water Is there anything else besides rivers, lakes and oceans that we all know?
• 7. The density of water is 1.0 * 10 ^ 3kg / m ^ 3. What is its scientific significance?
• 8. Experiment: is there water or steam in the air? To study this problem, let's do a small experiment first Take a big bottle with a cap (or wide mouth bottle), add some ice in it, and cover the bottle in time. Carefully observe what changes will happen inside and outside the bottle? __________________________________________________________________ __________________________________________________________________ Conclusion: after observation and thinking, I think the water on the inner wall of the bottle is made of water_______________ The water on the outer wall of the bottle is made of water_________________ It's not the same This shows that there are many problems in the air__________________ . Dear brothers and sisters, I don't understand the above scientific questions. I hope you can answer them for me,
• 9. 1: Fill in the name of the country When () is day, () is night, () is morning, () is dusk 2： If the opening ceremony of the 2008 Beijing Olympic Games is set at 20 p.m., when should viewers from the United States, Germany, Australia and other countries watch the live broadcast?
• 10. Primary school fifth grade science topic, urgent What idioms do you associate with the following words? Write them in brackets Example: Chimonanthus praecox -- (icy) summer -- (scorching sun) Fable -- () desert -- () space -- () I'm sorry. I'm sorry. It's a Chinese topic.
• 11. Mathematics 2 / 7 times (- 5 / 12) - 3 / 7 times 5 / 12 + 5 / 7 times 17 / 12
• 12. (): () = 0.375 = 9 of 40 = () / 16 = ()% Those who are in a hurry are rewarded
• 13. Simple calculation of 28 * 46 + 72 * 51
• 14. How many decimeters is three fifths of a meter
• 15. 3 and 3 / 4 * (3 / 5 and 8-1.375)
• 16. Calculation: (1) x + 2Y + (4Y ^ 2 / x-2y) (2) (x / x ^ 2-1) divided by (x ^ 2 + 4x + 3) / (x ^ 2 + 2x + 1) (3) 12 / (m ^ 2-9) plus 2 / (3-m) X + 2Y + 4Y ^ 2 / (x-2y)
• 17. In 2012, the number of days with excellent air quality in our city accounted for 2 / 3 of the whole year?
• 18. In 2000, 1972, 1800, 1994 and 2012, what are leap years?
• 19. 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
• 20. Make a circle through a (a, 0): x ^ 2 + y ^ 2 = R ^ 2 (a > R > 0), and find the path of the middle point of the chord cut by circle o