The basic operation of the set should be explained in detail

Basic operations on sets: addition, subtraction, multiplication, division.

The principle of division: b=aa+b-a

The basic operations for sets are as follows:Analysis: "single digit" positioning, "ten-digit" positioning, and intersection exchange method in the positioning method.

For example, with the composition of two digits, the ten digits of each two-digit number and the single digit number can not be the same, the "single digit" positioning, "ten-digit" positioning, and exchange method in the positioning method.

The "single digit" positioning method is to locate 1 in the single digit: degree; Position 2 in the single position; Position 3 in the single position.

When counting, care must be taken that there are no duplicates, no omissions. In order to prevent the overlapping part from being counted repeatedly, a new counting method has been developed, and the basic idea of this method is: the number of all objects contained in a certain content is calculated first, and then the number of repeated calculations is excluded when counting, so that the result of the calculation is neither missing nor repeated, and this counting method is called the principle of repulsion.

Both have x

then the remaining x = 1, xy = y or xy = 1, x = yx = 1

If x=1, then there are two 1s, which does not meet the heterogeneity of the set elements so x=-1, then xy=y has -y=y, y=0 so the three numbers are 1, -1, 0, yes.

xy=1，y=1/x

Substituting x = y

x = 1x = 1, then there are two 1s, which is not true.

So x=-1, y=0

It's obvious when you draw a picture

The simplified b set is actually a section of the straight line x+1=y.

The two endpoints are (0,1)(2, and 3).

Whereas the A set is a parabola with an opening pointing upwards.

For a to intersect a ≠ b, the cross-section must have an intersection with the parabola.

Make the cross-section and the parabola have an intersection point, and substitute (2,3) into the orange eggplant and jujube parabola.

y=2m+6

So when 2m+6 is less than 3, that is, when m -3 2, throw and intercept.

There is an intersection. Sincerely!

First, the title is accompanied by the title: from the meaning of the question, x is unequal to -4 or 2, and b is set as 3, so c is equal to 3

When the nuclear beat x=3, find a

The second question will be asked later.

Here you go again.

The basic operation of a set is generally based on the basic properties of a set.

Specific: Nature of the set:

Determinism: Every object can determine whether it is an element of a set or not, and cannot be a set without certainty, for example, "tall classmates" and "very small numbers" cannot form a set.

Anisotropy: Any two elements in a set are different objects. If it can't be written, it should be written.

Disorder: It's the same set.

The set has the following properties: if a is contained in b, then a b = a and a b = b

Representation of sets: Commonly used are enumeration and description.

1.Enumeration method: It is often used to represent a finite set, listing all the elements in the set one by one and writing them in curly brackets, this method of representing the set is called the enumeration method.

2.Descriptive method: It is often used to represent an infinite set, and the common attributes of the elements in the set are described in words, symbols or formulas, etc., and written in curly brackets.

x is the general form of the elements of the set, and p is the common property of the elements of the set) e.g., the set of positive real numbers less than is denoted as:

3.Schematic method: In order to visually represent a set, we often draw a closed curve (or circle) and use its interior to represent a set.

The landlord can search down, set the basic operations.