1. additive commutative law;
When two numbers are added, the positions of addends are exchanged, and their sum is unchanged, that is, A+B = B+A.
2. Additive associative law:
Add three numbers, first add the first two numbers, then add the third number; Or add the last two numbers first, and then add the first number, and their sum is unchanged, that is, (a+b)+c=a+(b+c).
3. Multiplicative commutative law;
When two numbers are multiplied, the position of the exchange factor remains the same, that is, a? b=b？ Answer.
4. Multiplicative associative law:
Multiply three numbers, first multiply the first two numbers and then multiply the third number; Or multiply the last two numbers first, and then multiply them with the first number, and their products remain the same, that is, (a? b)？ c=a？ (b？ C) carry out the test.
5. Multiplicative distribution law:
When the sum of two numbers is multiplied by a number, you can multiply the two addends by this number and then add the two products, that is, (a+b)? c=a？ c+b？ C.
Mathematical knowledge points in Xiaoshengchu: algorithm formula
1. additive commutative law;
When two numbers are added, the positions of addends are exchanged, and their sum is unchanged, that is, A+B = B+A.
2. Additive associative law:
Add three numbers, first add the first two numbers, then add the third number; Or add the last two numbers first, and then add the first number, and their sum remains the same, that is, (a+b)+c=a+(b+c).
3. Multiplicative commutative law;
When two numbers are multiplied, the position of the exchange factor remains the same, that is, a? b=b？ Answer.
4. Multiplicative associative law:
Multiply three numbers, first multiply the first two numbers and then multiply the third number; Or multiply the last two numbers first, and then multiply them with the first number, and their products remain the same, that is, (a? b)？ c=a？ (b？ C) carry out the test.
5. Multiplicative distribution law:
When the sum of two numbers is multiplied by a number, you can multiply the two addends by this number and then add the two products, that is, (a+b)? c=a？ c+b？ C.