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Decreasing characteristics are represented by letters.
Subtract a number from a number and add the same number, and a number remains the same, that is, (a-b)+b = a.

If you subtract the difference between two numbers from a number, you can subtract the minuend of the difference from this number (if you can subtract it) and add the minuend of the difference; Or add subtraction in the difference first, and then subtract the minuend in the difference, that is, a-(b-c) = a-b+c or a-(b-c) = a+c-b.

meaning

Subtraction is a mathematical operation that represents the operation of removing an object from a collection. Its symbol is the minus sign (? )。 Like five? Two apples, five apples, two were taken away, leaving three apples. So 5? 2=3。 Subtraction is to remove or reduce physical quantities and abstract quantities with different objects (including negative numbers, fractions, irrational numbers, vectors, decimals, functions and matrices).

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