Multiplicative distribution law:
The most commonly used method in simple calculation is multiplication and distribution law. Multiplication and division means 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 common divisor), especially when A and B are complementary to each other, this method is more useful.
Sometimes the law of additive combination is used, for example, a+b+c, and B and C are complementary, so that B and C can be combined and multiplied by A. If+in the above formula is replaced by X, it can also be simply calculated by the multiplicative associative law.
Law:
Multiplicative commutative law;
Multiplicative commutative law is used to exchange the positions of various numbers: a× b = b× a.
Additive commutative law;
Additive commutative law is used to exchange various numbers: a+b = b+a.