Chapter 19 Axisymmetric

19. 1 axisymmetric

19.2 is used for axisymmetric graphics.

19.3 isosceles triangle

Chapter 20 Linear Functions

20. 1 variables and functions

20.2 linear function

20.3 From the perspective of function, look at equations (groups) and inequalities.

20.4 Project learning options

Chapter 21 multiplication, division and factorization of algebraic expressions

2 1. 1 multiplication of algebraic expressions

2 1.2 multiplication formula

Division of 2 1.3 algebraic expression

2 1.4 factorization

Chapter 22 Scores

22. 1 score

22.2 Fractional operation

22.3 fractional equation

Grade 9 (1)

Chapter 28 Rotation

28. 1 graphic rotation

28.2 Center symmetry

28.3 Project research mode design

Chapter 29 Circle

29. 1 circle

29. 1. 1 circle

29. 1.2 perpendicular to the diameter of the chord

29. 1.3 Arc, chord and central angle

29. 1.4 circumference angle

29.2 Position relationship of points, lines, circles and circles

29.2. 1 Position relationship between point and circle

29.2.2 positional relationship between straight line and circle

29.2.3 The positional relationship between circles.

29.3 Regular polygons and circles

29.4 Arc length and sector area

Chapter 30 Preliminary Probability

30. 1 random events and probability

30.2 Calculate probability by enumeration.

30.3 Use frequency to estimate probability

30.4 Study the arrangement of letters on the keyboard.

Chapter 31 Quadratic function

3 1. 1 quadratic function and its image

3 1. 1. 1 quadratic function

3 1. 1.2 image of quadratic function y=ax2

3 1. 1.3 image of quadratic function y=ax-h2+k

3 1. 1.4 image of quadratic function y=ax2+bx+c

*3 1. 1.5 Use the undetermined coefficient method to find the analytical formula of quadratic function.

3 1.2 Looking at the quadratic equation of one variable from the point of view of function

3 1.3 Practical Problems and Quadratic Functions

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