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简介:
+ +
= + +
= +
= 1
加法交换律:a+b+b=a+c+b
- -
= - -
= -
=
减法交换律:a-b-c=a-c-b
+ -
= - +
= 1 +
= 1
加减法交换律:a+b-c=a-c+b
+ +
= +( + )
= + 1
= 1
加法结合律:a+b+c=a+(b+c)
1 - -
= 1 -( + )
= 1 - 1
= 0
减法的性质1:a-b-c=a-(b+c) - +
= -( - )
= - 1
=
减法的性质2:a-b+c=a-(b-c)