Data expansion:
Addition, subtraction, multiplication and division are called elementary arithmetic. Among them, addition and subtraction are called first-order operations, and multiplication and division are called second-order operations.
Off-line calculation:
Formula calculation is a recursive equation calculation, which is an operation to write out the calculation process completely, that is, vertical calculation. When calculating mixed operations, it is usually to calculate an expression step by step and step by step. The equal sign cannot be written on the original formula, but the process of each step should be written. Generally speaking, the equal sign should go forward and not be aligned with the first line.
Parenthesis introduction:
Parentheses generally refer to symbols used to indicate comments in an article. This kind of comment is parenthesis sandwiched in the middle of the text. When writing an article somewhere, in order to make readers understand it more thoroughly, sometimes it is necessary to add notes, or to change the order of operations in operation, and brackets are also needed.
Introduction to mathematics:
Mathematics is a subject that studies concepts such as quantity, structure, change, space and information. Mathematics is a universal means for human beings to strictly describe and deduce the abstract structure and mode of things, and can be applied to any problem in the real world. All mathematical objects are artificially defined in essence. In this sense, mathematics belongs to formal science, not natural science. Different mathematicians and philosophers have a series of views on the exact scope and definition of mathematics.
Symbol:
Perhaps China's ancient arithmetic is one of the earliest symbols used in the world, which originated from divination in Shang Dynasty. Most of the mathematical symbols we use today were invented after16th century. Before that, mathematics was written in words, which was a hard procedure that would limit the development of mathematics.
Today's symbols make mathematics easier for people to operate, but beginners are often afraid of it. It is extremely compressed: several symbols contain a lot of information. Like music notation, today's mathematical symbols have clear grammar and information codes, so it is difficult to write them in other ways.