chapter one

A dollar at a time is different from a dollar at a time.

1, inequality relation

2. Basic properties of inequality

3. Solution set of inequality

4. One-dimensional linear inequality

5. One-dimensional linear inequalities and linear functions

6. One-dimensional linear inequality system

chapter two

Decomposition factor

1, common factor method

2, using the formula method

chapter three

mark

1, multiplication and division of fractions

2. Addition and subtraction of fractions

3. Fractional equation

chapter four

similar figures

1, the ratio of line segments

2, the golden section

3. Graphics with the same shape

4. Similar polygons

5. similar triangles

6. Explore the conditions of triangle similarity

7. Measure the height of the flagpole

8. Perimeter ratio and area ratio of similar polygons

9, graphics zoom in and out

chapter five

Data collection and processing

1, time spent doing housework every week

2. Data collection

3. Frequency and frequency

4. Data fluctuation

5. Proof (1)

6. Are you sure?

7. Definition and proposition

8. Why are they parallel?

9. If two straight lines are parallel.

10, proof of the theorem of sum of interior angles of triangle

1 1. Pay attention to the outer corner of the triangle.