Chapter 21 One-variable quadratic equation:

(1) One-variable quadratic equation. (2) Solve a quadratic equation. (3) Practical problems and quadratic equations with one variable.

Chapter 22 Quadratic Function:

(1) quadratic function and its images and properties. (2) Quadratic function and linear equation. (3) Practical problems and quadratic functions.

Chapter 23 Rotation:

Rotation of (1) graph. (2) Central symmetry. (3) Subject study: pattern design.

Chapter 24 Circle:

Some properties of (1) circle. (2) The positional relationship between a point and a circle, a straight line and a circle. (3) Regular polygons and circles. (4) Arc length and sector area.

Chapter 25 Preliminary Probability:

(1) Random Events and Probability. (2) Find the probability by enumeration. (3) Use frequency to estimate probability.

Specific:

1, algebraic formula, rational formula.

Formulas that associate numbers or letters representing numbers with operational symbols are called algebraic expressions. A single number or letter is also algebraic.

Algebraic expressions and fractions are collectively called rational forms.

2. Algebraic expressions and fractions.

Algebraic expressions involving addition, subtraction, multiplication, division and multiplication are called rational expressions.

Rational expressions without division or division but without letters are called algebraic expressions.

Rational number formula has division, and there are letters in division, which is called fraction.

3. Monomial and polynomial.

Algebraic expressions without addition and subtraction are called monomials (the product of a number and a letter includes a single number or letter).

The sum of several monomials is called polynomial.