1 Integers, rational numbers, and irrational numbers are all real.

2 Provides a class that fully - encapsulates rational number operations.

3 By the operation rules of unascertained rational number, the expression of unascertained weight coefficient is derived.

4 Applying unascertained rational number to evaluate the achievements of sports gives the reliability of evaluation.

5 On expressing any positive rational number as sum of different terms of a given subsequence of harmonic sequence, some particular cases are studies.

6 The unascertained rational number with higher order can precisely simulate the situation of the market and give much information and alternative strategies for the enterprise.

7 Why collectivity is integral, rational number can form gather, is gather those who there is determinism?

8 A rational number can be expressed as a ratio of two integers.

9 This code is for finding an rational number complete source code, has been tested.

10 By indirectly applying the Eisenstein discriminant method, this paper explores and discusses two ways of judging the integral coefficients polynomials to be irreducible over the rational number field.