The blame should be put squarely on the shoulders of tophatter.com. They know the quality of what is being sold and choose to look the other way for the sake of making commission and sales fees on these imitation goods. In my estimation and also the interpretation of the law this is outright FRAUD.
Inverse operations are opposite operations that undo each other. Addition and subtraction are inverse operations. Multiplication and division are inverse operations.
The order of operations is the order in which we add, subtract, multiply or divide to solve a problem. The steps that we use to solve any mathematical expression are: Simplify all of the parentheses. This includes all forms of the grouping symbols such as brackets, braces and parentheses. Simplify all exponents.