Please write all trinomials containing only the letters x, y and coefficients 2

2x²y
2xy²

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1. XY is a monomial, and explain why. A single number or letter is also called a monomial, so is 1 a monomial?
2. Given that the sum of the monomials XY ^ 2a-1 / 3 and 10xy ^ A + 1 / 2 are still monomials, then a=________
3. With four rational numbers: 3,4, - 6,10, write three different methods of operation, so that the result is equal to 24, three different methods!
4. ①.X²-2X+1/X²-1 ÷ X²-X/X+1 ②.a-1/a²-4a+4 ÷ a²-1/a²-4 ③.x³-x²/x²-x ÷ x²-2x/x-1 ④.(x-y)²/x+y ÷ 1/y+x X 1/x-y Do me a favor
5. The addition and subtraction of fractions in the second volume of the eighth grade! Only 15 and 16 questions! Where a × a + ab-2b × B = 0 2.a÷〔(a-b)(a-c)〕+b÷〔（b-c)(b-a)〕+c÷〔(c-a)(c-b)〕 3.(2x+z-y)÷(x×x-xy+xz-yz)-(2x+y+z)÷(x×x+xy+xz+yz) 4.1÷(a+1)+1÷(a+1)(a+2)+… +1÷(a+2007)(a+2008) Note: a × A is the square of a and so on, [
6. x2-(y-z)2 ------------ (x+y)2-z2
7. Xiaolan's mother bought several bottles of yogurt for 12.5 yuan in the supply and marketing building, but she found in the food optional room of the department store that the same yogurt was 0.2 yuan cheaper than each bottle in the supply and marketing building. Therefore, when she bought yogurt for the second time, she went to the Department store to buy it. As a result, she spent 18.4 yuan and bought 3 / 5 more bottles than the first time. How many bottles of yogurt did she buy in the supply and marketing building for the first time?
8. The operation of fraction in grade eight It is known that a is not equal to B, B is not equal to C, C is not equal to a, and a / (B-C) + B / (C-A) + C / (a-b) = 0 It is proved that a / (B-C) ^ 2 + B / (C-A) ^ 2 + C / (a-b) ^ 2 = 0
9. Addition and subtraction of fractions What is 5 / 6ab-2 / 3aC + 3 / 4abc
10. Fractional addition and subtraction (3x³-12x)/(x²-2x) – (x³-4x)/(x²+2x)
11. -What is the coefficient of 15ab? What is the number of times and terms? What is the coefficient of a-2ab + B? What is the number of times and terms?
12. Number of items, coefficient and times
13. A monomial with the letters x, y and the coefficient is 2, the degree is 3, write out all the monomials satisfying its conditions
14. 1. If the N-1 power of (a + 1) &# 178; multiplied by X & # 178; multiplied by Y is the quintic monomial of X and y, the conditions that N and a should satisfy are obtained 2. If (a + 1) & # (178); multiply the square of 2a of X by the power of N-1 of Y is the quintic monomial of X and y, the conditions that N and a should satisfy are obtained
15. If - MX ˇ NY is a monomial about X and y, and the coefficient is 3 and the degree is 4, then M =? N =?
16. The first problem of monomial elementary school The following statement is correct: A. (a + 2) / 3 is a monomial, b.b/a is a monomial, C. (M + 2) a is a monomial, D. - 3x ˇ 2Y / π is a monomial, note that D. is a negative number
17. What are the coefficients and times of 3 / 5 * m's Square * n's Square? There are unknowns in the molecule, and what can't be solved is the monomial?
18. If the letter factor of a monomial is the third power of a multiplied by the second power of B multiplied by C, and when a = 1, B = 2, C = 3, the value of the monomial is 2, then the coefficient of the monomial is?
19. Math problem: monomial! Use letters to represent numbers and translate the following written languages into symbolic languages The sum of two numbers with 1 being opposite to each other is 0 There is such a group of numbers: 3.6.9.12.., please indicate the nth number
20. 2 (2 minus x) plus 3 (4x minus 2) equals 7 (x plus 4),