9 (X-Y) ^ 2 + m + 4 is a complete square expression, and M expression is obtained

m=±2*2*3(x-y)=±12(x-y)

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1. Given that M belongs to R, f (x) = (m-1) x ^ 1 / M is a power function. (1) the expression for finding f (x): (2) if f (2-A ^ 2) ≥ f (a), find the value range of real number a
2. As shown in the figure, in the plane rectangular coordinate system, the image of quadratic function y = x + BX + C intersects with X axis and points a and B, point a is on the left side of the far point, the coordinate of point B is (3,0), intersects with y axis and points c (0, - 3), and point P is a moving point on the parabola below the straight line BC 1. Find the expression of this quadratic function 2. Connect Po and PC, and fold △ POC along CO to get quadrilateral pop ˊ C. is there a point P to make quadrilateral pop ˊ C diamond?
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4. The difference between database table and free table
5. Let L = 16, M = 15, NL = 19, n = L-M, the value of the expression n & n-1? What does n & n mean?
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7. Let f (x) be a periodic function, and the minimum positive period is 2, and f (1 + x) = f (1-x), if - 1
8. It is known that the domain of function y = f (x) is R +, f (8) = 3. For any x ∈ R, f (x1x2) = f (x1) + F (x2) conjecture expression Reasonable reasoning content, .' | | / | |/-.( | |\_ ._ \ | | \ \`;| | > |/| | / // | | |// | | \(\ | | `` | | | | | | | | | \\ _ _ \\| \// |//_ _ \// _ ^ `^`^ ^`` `^ ^` ``^^` `^^` `^ `^
9. Given that the function f (x) is an odd function and the domain of definition is r, when x > = 0, f (x) = - x2-2x, find the expression of F (x) in the domain of definition
10. Given the function f (x) = 2x-1, find the expression of F (x2) I feel dizzy=
11. How to understand that an event with probability equal to 1 is not necessarily an inevitable event, and an event with probability equal to 0 is not necessarily an impossible event, please elaborate in detail and give examples
12. Probability of relatively independent events in Mathematics There are 10 balls from No.0 to No.9, which are pulled out one at a time and then put back. The probability of pulling 1 is 1 / 10, that is to say, there will be one in 10 times. Then I want to know the probability of pulling 1 only after 20 times and how much is it after 30 times
13. For example: the event with probability 1 is not necessarily inevitable, and the event with probability 0 is not necessarily impossible
14. On the probability basic event space of mathematics compulsory 3 Take any 4 out of 50 products with 6 defective products, and observe the number of defective products. The basic event space is
15. The probability of occurrence of a is 60, and that of B is 40. What is the probability of occurrence of at least one of AB? (1-60) * (1-40) is that right?
16. A person forgets the last number of the phone number. He dials randomly and asks for the probability that he can dial correctly no more than three times? A .1/10 B .1/8 C.3/10 You can use the formula of 9 / 10 * 8 / 9 * 1 / 8 to calculate that the final answer is equal to answer A. I know, but what bothers me very much is that if you add the question no more than three times, then if you add the question no more than nine times, then the probability is still 1 / 10 when you dial nine times. It's a bit inexplicable here. Some of the translations haven't been practiced yet
17. There are three red balls and two white balls in the pocket. The texture is uniform and the shape is exactly the same. Pick out two balls randomly from them. Calculate the probability that both are red balls. (list or tree chart)
18. It is known that Party A and Party B are good friends. They agree to meet at the gate of Shanghai park from 9:00 to 10:00 one day. If one of them waits for 20 minutes within the agreed time and does not see the other, they will leave. If both of them fulfill their promise, what is the probability of the two good friends meeting?
19. Take any one of the four numbers from 1 to 4 as the numerator, and take any one of the three numbers from 2 to 4 as the denominator to form a fraction. What is the probability of a fraction with Coprime numerator and denominator?
20. There are five small cards of the same size, write 1,2,3,4,5 on them respectively, and then put them in the bag to mix well. Take three cards out of the bag each time, record the results, and then put them back into the bag to wash well. If there are three consecutive numbers, they are called "step height". For example, 1,2,3:2,3,4; 3,4,5. What is the probability of "step height"?