After rain, the sky and the earth are more like filtered, especially fresh Correct the wrong sentence

After rain, the air is more like filtered, especially fresh

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1. Sequence 2, 6, 12, 20, 30, 42 What's next?
2. People's education press fifth grade volume I mathematics textbook page 72 application question 4 how to do. Ask you a favor. In the afternoon Six pop cans and nine beverage bottles, each of which costs the same. The total price is 1.5 yuan. How much is each? Do it by solving the equation. seek
3. 2 / 3, 8 / 9, 2 / 3, 4 / 3, 2, (), fill in a number in the bracket to make the sequence hold,
4. Y = [the square of (x1-x) plus the square of (x2-x) plus the square of x3-x] divided by 3
5. A measuring cylinder containing 280 ml of water. After placing a glass marble, the water surface rises to 300 ml. the volume of this glass marble is______ ．
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7. The sum of three consecutive even numbers is 3A (a is not equal to 0), where the largest is (), and the smallest is ()
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9. There are 100 chickens and rabbits in total, and the number of legs of chickens is 30 less than that of rabbits. How many of them are there? It's 28 less
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11. Uncle Li's family has 42 chickens, half of which are ducks. How many chickens and ducks do Uncle Li's family raise?
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13. What are the common factors of 64 and 45 Yes!
14. English translation
15. Observe the following three lines: - 3, 9, - 27, 81, - 243 -5，7，-29，79，-245，… -1，3，-9，27，-81… (1) What is the order of the first row? (2) What is the relationship between the number of the second and third rows and the number of the first row? (3) Take the 10th number of the three rows and calculate the sum of the three numbers
16. The problem of increasing and decreasing functions and the problem of odd and even functions The definition field of y = f (x) is R. for any a, B belonging to R, f (a + b) = f (a) + F (b). When x > 0, f (x) < 0 holds, f (3) = - 3 1) It is proved that the function is a decreasing function over R 2) Prove that a function is an odd function 3) Functions in [M, n] m, n all belong to the range of n *
17. Odd function + non odd non even function=_______ Even function + non odd non even function=_______ Non odd non even function + non odd non even function=_______ Non odd non even function × non odd non even function=_______
18. Let a be an even function and B be an odd function, then the sum difference product quotient of a and B, the sum difference product quotient of a and a, and the sum difference product quotient of B and B are odd or even functions respectively? Even + - odd =? (even or odd) even × / odd =? (even or odd) Even + - even =? (even or odd) even × / even =? (even or odd) Odd + - odd =? (even or odd) odd × / odd =? (even or odd)
19. Is the odd power of odd function odd function or even function, even power? And even function odd power is odd function or even function, even power? For example, (SiNx) ^ n, n are odd and even numbers respectively (cosx) ^ n, n are odd and even numbers respectively
20. The even coefficient of odd function is equal to 0, and the odd coefficient of even function is equal to 0,