When a fraction is added, subtracted, and divided with itself, the sum, difference, and quotient of the result are added to 113. This fraction is______ ．

(113-1) △ 2, = 13 × 12, = 16; answer: the score is 16

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1. When a fraction is added, subtracted, and divided with itself, the sum, difference, and quotient of the sum, difference, and quotient are added up to two fifths（
2. The sum of the sum, difference and quotient of a fraction added, subtracted and divided by itself is 13 out of 3
3. When a fraction is added, subtracted, and divided with itself, the sum, difference, and quotient obtained are added up to 1 / 5. This fraction is []
4. When a number is added, subtracted and divided by itself, the sum of its sum, difference and quotient is 11.66. What is the number?
5. A decimal is added, subtracted and divided by itself. The sum of sum, difference and quotient is 11.2. What is the decimal?
6. It is proved that the monotonicity of the symmetric interval of even function is opposite Ah You know, you know, There are only two things I don't understand. I'm in a hurry Let y = f (x) be an even function, then f (- x) = f (x) If X1 > x2 > 0, then - x1f (x2), that is, f (x) decreases In the same way, it can be proved that f (x) is a decreasing function on the positive half axis and an increasing function on the negative half axis In this case, why is it necessary to assume that the positive semiaxis is monotonically increasing? Finally, why is f (- x1) > F (x2), that is, f (x) decreasing? How to judge?
7. What is a non odd non even function multiplied by a non odd non even function
8. Even function multiplied by non odd non even function is? For example, LNX * cosx Is odd function multiplied by non odd and non even function? For example, LNX * SiNx Does periodic function change periodically after multiplying by aperiodic function? For example, LNX * cosx?
9. How to judge non odd and non even functions
10. The even coefficient of odd function is equal to 0, and the odd coefficient of even function is equal to 0,
11. Ask a math problem: there are four children, one is one year older than the other, the product of multiplication is equal to 360, how many years old is the biggest?
12. Two numbers add up to 16, but when they are multiplied, they are 8 times larger than one of them. What are these two numbers? Two numbers add up to 16, but when they are multiplied, they are 8 times larger than one of them. What are these two numbers?
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14. How many is the sum of multiplication of 7 plus 2 divided by 5 and the remainder
15. The sum of three X's is (). The product of three M's is ()
16. If you add an integer to itself, you want to subtract, multiply, divide, and add up the sum, difference, product, and quotient to 37, what's the number?
17. The connection between rational numbers and irrational numbers? Is the sum, difference, product, division and square of two irrational numbers irrational? Is the sum, difference, product, division and square of rational and irrational numbers irrational? Please explain the reason and give examples. Thank you. If you answer well, it will increase the reward!
18. Does an irrational number have the smallest absolute value
19. In real numbers, there are__ ① The largest rational number, the smallest irrational number, the number with the largest absolute value, and the number with the smallest absolute value
20. It is known that a is a rational number, B and C are irrational numbers. Which of the following numbers must be irrational? Which are not? Which are not If it must be, please explain the reason; if not, please give an example. （1）a+b；（2）ab；（3）b+c；（4）bc