82×8=656

656-(86-70)=640

640÷8=80

82-80=2

Extended data subtraction formula

1, minuend-subtrahend = difference

2. Difference+Minus = Minus

3, the minuend-difference = reduction

Subtraction correlation characteristic

1, inverse exchange rate: subtraction is inverse exchange. If A and B are any two numbers, then

(A-B) =-(B-A)

2. Anti-association rule: subtraction is anti-association. When trying to redefine subtraction, then

a-b-c=a-(b+c)