The law of addition and subtraction is how much addend increases or decreases, how much sum increases or decreases, how much minuend increases or decreases, how much difference increases or decreases, how much minuend increases or decreases, and how much difference decreases or increases in turn.

Introduction:

Judging from the addition and subtraction strokes of single-character characters, most of these Chinese characters are pictographic and refer to things, and the glyphs themselves are vivid. By adding and subtracting strokes, you can become new Chinese characters, which shows the flexibility of Chinese characters.

Judging from the addition and subtraction of non-unique characters, most of these Chinese characters are loanwords, knowing words and pictophonetic characters, accounting for 80%. The glyph itself is generated to express a specific category or distinguish the original characters. Even if you don't know the words, you can know what it is related to by looking at the radicals, and you can roughly estimate the pronunciation by phonetic radicals.