In the fraction, the denominator represents the number of shares divided as a whole, and the numerator represents the number of shares taken specifically. If the denominator is 0, then divisible, that is, there is no specific number of copies, so the score is meaningless. Therefore, according to the basic principle of mathematics, the denominator of a fraction cannot be 0.
In mathematics, a fraction with a denominator of 0 is defined as nonexistent, which is also to ensure the accuracy and logic of mathematical expressions. At the same time, stipulating that the denominator cannot be 0 is also helpful to avoid undefined or infinite situations in the calculation process and ensure the rationality and accuracy of mathematical operations.