Multiply a negative number by a negative number and then multiply their absolute values. Because the symbols are the same, the same symbols are positive and are generally omitted.
Negative division is similar to multiplication, except that the absolute value is divided and the result is the answer.
For the mixed operation of negative numbers, the operation in parentheses must be calculated first, which is generally symbolic. Addition, subtraction, multiplication and division will occur, and then the multiplication and division method outside brackets will be calculated, and then the results will be calculated in turn. Finally, it is easy to get the answer.