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.
Model essay for primary school students' third-grade speech 1
Dear teachers and students:
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