On the natural number of Mathematics Do natural numbers contain 0? Question: any two natural numbers have a common factor 1. Who knows? And: 2 / 3 is greater than x interval (just one interval, useless) x is less than 2 / 5? The first aspect of judgment is: check and difference.

First √
The second 2 / 4 = 1 / 2

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1. What is natural number?
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5. The description of whether {the complete square of the five most decimal points in natural number} belongs to a set Does {the complete square of the five most decimal points in natural number} belong to the description of set?
6. In the natural number within 10, find out three different prime numbers to form a three digit number, so that the number is a multiple of 2 and 3 at the same time. The number may be ()
7. There are six different primes written on the six cards. The sum of the three fractions composed of these six numbers is 1001 parts a, where a is a natural number. Find the minimum value of A
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9. If n is a natural number, then the 2n + 1 power of (- 3) plus the 2n power of 3 (- 3) =?
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