1, additive associative law?

The law of additive combination is (a+b)+c=a+(b+c).

For example, 8+1+9 = 8+(1+9) = 8+10 =18.

2. additive commutative law?

a+c=c+a .

Such as 8+5=5+8= 13.

3. Multiplicative associative law

(axb)xc=ax(bxc).

For example 3x2.5x4 = 3x (2.5x4) = 3x10 = 30. ?

4. Multiplication and distribution law?

(a+b)xc=axc+bxc .

The most commonly used method in simple calculation is multiplication and distribution law.

Multiplication and distribution law: ax(b+c)=axb+axc, where A, B and C are arbitrary real numbers.

On the contrary, axb+axc=ax(b+c) is called the inverse application of multiplication and division (also called finding the common divisor), especially when A and B are complementary, and sometimes addition and association laws are used, such as a+b+c, B and C are complementary, so that B and C can be combined and multiplied by A, as shown in the above formula.