The second volume of mathematics in junior high school? There are still seven big questions left. Please, it's better to have an answer! If there is a picture, bring the best! O (∩)_ Thank you~~

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1. A measuring cylinder, containing 300 ml of water, put three steel balls with equal radius, and the water surface rises to 360 ml How many steel balls do you need to put to reach the 500ml mark of the measuring cylinder?
2. Factorization a ^ 3-2a-2b + B ^ 3
3. Decompose the following factors: A ^ 2 + A + 1 / 4 16A ^ 2-8ab + B ^ 2 A ^ 4-2a ^ 2B ^ 3 + B ^ 6 4(x+y)^2-12(x+y)+9 x^2-2x(y-z)+(z-y)^2 a^4-2a^2b^2+b^4
4. 20A ^ 4-33a ^ 2B ^ 2 + 7b ^ 4 （x^2-5x)^2+10(x^2-5x）-96 x^2-(a+b)xy+aby^2 X ^ 2 + X - (a ^ 2-A) A question is OK ~ best all, seems to be about cross multiplication! All four questions!
5. -The third power of 2A * the square of B + the square of 8A * the square of B - the square of 8A * B
6. -The cubic power of 2A B + the square of 8A the square of B - the cubic power of 8ab
7. If there is only one element a in the set a = {x x square + ax + B = x}, the values of a and B are obtained One more question Set u = {x, X is less than or equal to 10, X belongs to n}, a (symbol I can't play, that is, there is a U lying below with a horizontal) u, B (same as above) U So give 30 points to those who can answer all the questions One more question. A total of 40 points
8. Problem 1: given the square of set {x | x + ax + B = 0} = {2,3}, find the value of a and B The second problem: represent the set ① {(x, y) | x + y = 6, X ∈ Z, y ∈ Z} ② {- 3, - 1,1,3,5} The third problem: given a = {1,0, - 1,3} B = {y | y = | x |, X ∈ a}, then B?
9. If there is only one element a in the set a = (x / x square + ax + B = 0), the value of A.B is obtained?
10. It is known that: a ≠ B, and the square of a-2a-1 = 0, the square of B + 2b-1 = 0, find a + 1 / b And the value of a / b? No dead reckoning
11. Sequence 1,8,9,4, (), 1 / 6 who knows what to put in brackets
12. As shown in the figure, AC ∥ BD, ab ∥ CD, ∥ 1 = ∥ e, ∥ 2 = ∥ F, AE intersects CF at point O, try to explain: AE ⊥ CF
13. 2, - 6,12, - 20,30 and - 42 constitute a sequence to find the general term formula
14. 18. Making sentences with green Pinyin
15. Li Dabo's family raises 180 chickens and ducks, and the number of ducks is one fifth of that of chickens. How many chickens and ducks does Li Dabo raise
16. A device for calculating ideas, strategies, plans, measurements, or calculations
17. What can be found from the product of the greatest factor and the least common multiple of 16 and 24
18. Translation of all texts in unit 1 of junior three English
19. Observe the following numbers: (1) - 3,9, - 27,81, - 243729. (2) 0,12, - 24,84, - 243729. (3) - 1,3, - 9,27, - 81243 Take the 10th number in each row and calculate the sum of the three numbers
20. What are the types of computers? What are their characteristics?