What is the rule of1+2+3+4+5 = 3 * 52+3+4+5+6 = 4 * 53+4+5+6+7 = 5 * 5?

Literally, the multiplier of each series is 5, 5 is the cardinal number of all series (that is, all series * * * have five numbers), and the multiplier is the median of all series (that is, a numerical value in the middle of the series).

Mathematics [English: Mathematics, derived from the ancient Greek μ θ η μ α (má th ē ma); Often abbreviated as math or maths], it is a discipline that studies concepts such as quantity, structure, change, space and information.

Mathematics is a universal means for human beings to strictly describe 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.

Subject: Mathematical symbols

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.