Given that 1 / 4 > 2 / 4 > 1 / 5, a is a non-zero natural number, then a is ()

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• 1. A is a non-zero natural number. In the following formulas, the smallest number is () A.A × 2 / 5 B.A × 7 / 5 C.A △ 1
• 2. a. 1 / a △ 2 / 7 = 1 / b × 3 / 5 = 1 / C, the following correct is () 1. A ＞ B ＞ C 2. A ＞ C ＞ B 3. B ＞ C ＞ a
• 3. It is known that a and B are non-zero natural numbers, and a + B = 100. What is the maximum and minimum product of a and B?
• 4. Three out of seven × [] = 9 × [] = four out of five △ [] = a × [] 0
• 5. Known inequality 1 / N + 1 / N + 1 + 1 / N + 2 + 1 / 2n + 1 ＜ 11a / 3 + 11 / 6A holds for any n ∈ n *. Find the value range of real number a
• 6. It is known that for any natural number n, the inequality (nlga0) holds, then the value range of a is It is known that for any natural number n, the inequality NLGA ＜ (n + 1) LGA ^ n (a > 0) holds, then the value range of a is () A 0＜a＜1 B a＞1 C 0 < a < 1 / 2 d 0 < a < 1 / 2 or a > 1 Why D
• 7. If inequality 1 / (n + 1) + 1 / (n + 2) + +If 1 / (n + 2n) > m / 2100 holds for all natural numbers n greater than 1, then the maximum value of integer m is
• 8. According to the natural number from small to large as the standard order, find the following permutation of reverse order number 25 （3n-1）3 6… （3(n-1））（3n)
• 9. What is a prime number? Is it the same as a prime number? And is 0 a natural number? I've been working on the topic these days
• 10. The two adjacent natural numbers (except 0) of the judgment question (1) must be prime numbers. (2) two different prime numbers must be coprime numbers. (3) two kinds of numbers that become coprime numbers. At least one number is prime
• 11. The sum of 15 non-zero natural numbers is 76, and one of them must be greater than or equal to 6. Why?
• 12. The numerator of a false fraction is 55. After transforming the false fraction into a band fraction, the integer part, numerator and denominator are adjacent natural numbers, and the band fraction is 55______ ．
• 13. The numerator of a false fraction is 47, which is transformed into three continuous natural numbers with fractions, numerator denominator and integer
• 14. Can other non-zero natural numbers be converted into pseudo fractions with denominators of 1, 2, 3?
• 15. 8 / X (x is a non-zero natural number), which is a true fraction; when x is (), it is the smallest false fraction; when x is greater than (), it is a true fraction; when x is greater than (), it is the smallest false fraction; When x is () Yes, it is the smallest composite number
• 16. If we know that seven a is a false fraction and eight a is a true fraction, then a = () (a is a natural number)
• 17. The quotient of a natural number divided by a false fraction is less than the divisor, right Two numbers, no matter what, as long as the product is 1, they must be reciprocal to each other. Right If we say that "the area of corn field is equal to seven ninth of that of wheat field", then "the area of corn field is less than that of wheat field" Two out of nine. Right? Online waiting for the answer, offering a reward of 10 points
• 18. A natural number greater than zero multiplied by fractional product must be less than this number
• 19. A is a non-zero natural number. Among the true fractions whose denominator is a, the smallest is () and the largest is. Among the false fractions whose numerator is a The smallest is, the largest is
• 20. Let 1, 2, 3 It is known that the last 13 digits of the product are all exactly 0. May I ask: what is the minimum natural number that appears at the end of multiplication?