Nature of proportion

1. The product of internal terms is equal to the product of external terms. If a/b=c/d, ad=bc.

2. the ratio property, if a/b=c/d, then (a+b)/b = (c+d)/d.

3. Fractional property, if a/b=c/d, then (a-b)/b = (c-d)/d.

Fractional knowledge point

The numerator and denominator of a fraction are multiplied or divided by the same number (except 0) at the same time, and the size of the fraction remains the same. This is called the basic nature of fractions. The basic nature of fraction is the theoretical basis of reduction and general fraction.

The construction mode of mathematical mind map is to determine a central theme, lead out sub-themes, and then divide the sub-themes into levels. The specific operation steps are as follows.

1, use the most concise language to determine the mathematical theme to be drawn. Take "angle measurement" as an example.

2. An angle is a figure composed of two rays drawn from a point. So get to know the rays first.

3. Draw line segments and straight lines with rays and compare their similarities and differences.

4. For important knowledge points about angles, you can mark keywords on the mind map.

Precautions:

In the above mind map, the definition of light is derived from angle, and a relationship line is drawn between angle and light, which is convenient for us to connect knowledge points in series.

Mind mapping uses the skills of paying equal attention to graphics and texts, showing the relationship between topics at all levels with hierarchical diagrams of mutual subordination and correlation, and establishing memory links between topic keywords, images and colors.

It makes full use of the functions of the left and right brains to help people develop in a balanced way between science and art, logic and imagination, thus opening up the infinite potential of the human brain.

Mind mapping is an effective way of thinking. The application of mind mapping in memory, learning and thinking is beneficial to the spread of thinking in human brain.