OK. now you are right. However, you should know that the division by zero is impossible in the sense of inversion of the product.
In such a case, we will consider some general sense or extension of fractions. Our definition will be natural as mathematics.
Moreover, in many and many fractions in physic, their senses will be given by our generalized sense. We showed many examples.
Moreover, in the Yamada field containing the division by zero, our definition is natural, please look the simple structure of the Yamada field.
Furthermore, Michiwaki family showed that our division by zero 1/0=0/0=z/0 are trivial and clear from the intuitive sense of division with 6 years old daughter.