There are only four rational numbers, of which the sum of every three numbers is 3, 5, 13 and 15 respectively. How much is the product of these four rational numbers emergency

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• 1. 1. If the rational numbers a and B are opposite to each other, then the sum of the two numbers is? If the rational numbers a and B are reciprocal to each other, then the product of the two numbers is? 2. Calculation (- 0.25) x0.5x (- seventy and three fifths) X4 (- one and two thirds) x (- 18) - 15x one and two thirds Ten and four fifths x (- 25) We need the formula!
• 2. The following statement is wrong () A. Any rational number has reciprocal B. the product of reciprocal numbers is 1C. Reciprocal numbers have the same sign D. 1 and - 1 are reciprocal numbers
• 3. If the sum of two rational numbers is 0, then the product of the two numbers must be equal to minus one If the sum of two rational numbers is 0, then the product of the two numbers must be negative one, right or wrong, why
• 4. Mathematics in grade one of junior high school: is π 2 / 2 a fraction? Is it a rational number Our teacher said that those with π are not fractions, right
• 5. Rational number multiplication [- 10] * 3 * [- 1 / 2] * [- 5 and 1 / 3] * 4 / 5 [- 10] * 3 * [- 1 / 2] * [- 5 and 1 / 3] * 4 / 5 [- 17] * [- 2] * 34 * 0 * [125] 16 * [- 18] * 0.25 * [- 1] [- 4] * [+ 8.9] * [- 0.25] [- 2] - [+ 5 / 6] * [- 3 / 5] - 4-2 * 32 + [- 2 * 32] [7 / 6 + 5 / 4 + 3 / 18] * 36 [1 / 3 2 - [1 / 3-6 + 5 / 12] * 2.4] * 5
• 6. Positive rational number: 3, 2 / 3, 50, 2.5, 4 / 3. Negative rational number: - 7, - 2 / 3, - 0.8, - 10.5, - 11. Please select 2 positive rational numbers and 2 negative rational numbers from them, and then use the three symbols in "+, -, ×, △" to perform three operations on the selected 4 numbers, so that the operation result is 0, and write two formulas that meet the conditions
• 7. On the concept of rational number in the first day of junior high school It is said in the book that generally, a minus sign is added before the rational number, but there is also a minus sign at the beginning of some formulas, and there are no brackets. Does it mean the opposite number or the negative number? Please help me, It's not a minus sign, it's a similar sign For example: -50 divided by 2 times (1 / 5) - 2 times (- 3) times (- 4) Just for an hour,
• 8. Who has the exercise of rational number in the first grade of junior high school Any question is OK, as long as the classic point, often test or uncommon questions on the line, can you also send the answer to it
• 9. The concept of multiplication and division of rational numbers in the first year of mathematics of people's Education Press In urgent need of brothers and sisters
• 10. rational number
• 11. Write a number whose product with 2 √ 3 is a rational number
• 12. If the sum of products of two numbers is known and one of them is - 2 and 3 / 7, find another number Given that the quotient of two numbers is - 3 and 1 / 2, and one of them is 2 and 1 / 3, find another number The title says that the product of two known numbers is 1, so it's wrong.
• 13. Using the mixed operation of addition and subtraction of rational numbers, (- one fifth) + two fifths + (- three fifths) Using the method of mixed operation of addition and subtraction of rational numbers, 1. (- one fifth) + two fifths + (- three fifths) 2.（-7）-（-5）+（-4）-（-10） 3.4.7-（-8.9）-7.5+（-6） 4. - half + (- one sixth) - (- one fourth) - (+ two thirds) 5. - half - five and one fifth + 4.5 + Half - 4.5 + five and one fifth 6.（-2.5）-（+2.7）-（-1.6）-（-2.7）+（+2.4） 7. 3 / 4-7 / 2 + (- 1 / 6) - (- 2 / 3) - 1
• 14. Is Dirichlet function continuous almost everywhere on R? I know it's discontinuous everywhere. Is it continuous almost everywhere in real change?
• 15. Why is Dirichlet function not continuous? It is said that Dirichlet function is discontinuous everywhere According to the definition of continuity, if f (x0) = LIM (x - > x0) f (x), the function is continuous at x0 For example, it is known that x0 belongs to Q. if it is not continuous, LIM (x - > x0) must not belong to Q. how to verify that LIM (x - > x0) does not belong to q?
• 16. Why can't Dirichlet higher numbers be expressed as limit functions of continuous functions
• 17. Some problems on Dirichlet function For: 1. Is a periodic function, 3 is a period of it; 2. The equation f (x) = cosx has rational roots; 3. The equation f [f (x)] = f (x) has the same solution set as the equation f (x) = 1 In fact, Dirichlet function refers to: (1) when x is a rational number, f (x) = 1; (2) when x is an irrational number, f (x) = 0
• 18. Dirichlet function On Baidu Encyclopedia The Dirichlet function over the real number field is expressed as: D(x)=lim(n→∞){lim(m→∞)[cosπm!x]^n} 　(1)　 It can also simply express the form of piecewise function d (x) = 0 (x is irrational) or 1 (x is rational) (2) The process of finding (1) and pushing (2)
• 19. The famous Dirichlet function is defined like this What are the independent variables and the dependent variables of this function What are the definition and value ranges of this function Please write the function values when x = - 1, root 2, 6.4 and 3.1415 respectively
• 20. Besides Dirichlet functions, which functions are Riemann non integrable and Lebesgue integrable,