减法 Subtraction

减法是寻找两个数的差的算术运算,可视为「加法的逆运算」。减法是符号是减号()。加、减、乘、除合称四则运算。
在数式里,
称为被减数,
称为减数,
是
和
的差。
减去一个数等于加上这个数的相反数。若果被减数小于减数,得出来的差将会是负数。
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释义 |
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Subtraction is a mathematical operation that represents the operation of removing objects from a collection. It is signified by the minus sign (−). For example, in the picture on the right, there are 5 − 2 apples—meaning 5 apples with 2 taken away, which is a total of 3 apples. Therefore, 5 − 2 = 3. Besides counting fruits, subtraction can also represent combining other physical and abstract quantities using different kinds of objects including negative numbers, fractions, irrational numbers, vectors, decimals, functions, and matrices.
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