1. Select the endpoints to count sequentially (from left to right or from right to left).

2. Count the basic line segments first, and then the combined line segments.

Line segment method: The line segment method is an upgraded version of the Chinese character crossing method, and its principle lies in simplifying the steps and calculation process of the equation. The line segment method is a classic skill used in mathematical operation and data analysis, which has a near-spike effect on the calculation of mixed proportion problems. As an upgraded cross method, the core of line segment method is to simplify the steps and calculation process of understanding equations. Mastering this method can greatly save the calculation time of candidates and improve the correct rate.

The so-called line segment method is the Plath version of the cross method, and its core lies in simplifying the steps and calculation process of the equation. Mastering Dafa skillfully can greatly save time and improve the efficiency of preparing for exams.

Places that can be used:

1, mixing ratio problem. Mixing means that two or more parts are mixed together to form a whole, and the core of the mixing problem lies in figuring out the relationship between the whole and the parts.

2. The so-called proportion means that the calculation formula is the form of dividing two quantities, just like concentration = solute quality/solution quality, discount = selling price/pricing; Average = total number/number; Profit rate = profit/cost; Specific gravity = part/whole, etc.

Questions that can be used frequently:

1, concentration mixing;

2. Average problem;

3. Mixed profit rate;

4. Discount mixing;

5. Proportional mixing and growth rate mixing.

Line segment method: when a whole is composed of several parts, the growth rate of the whole must be between the growth rates of the parts, and it will be biased towards the growth rate of the part with larger base period value.

Draw a line segment on the draft paper, put the growth rates of the two parts before mixing on both sides of the line segment, put the mixed growth rate in the middle of the line segment, and divide the line segment into two parts. The length of the line segment is expressed by the growth rate, and the ratio of the base period of the two parts is inversely proportional to the corresponding line segment length.

Line segment properties:

Of all the straight lines connecting two points, the line segment is the shortest. It is called the shortest line segment between two points. So the sum of two sides of a triangle is greater than the third side. It has a limited length and can be measured; There are two endpoints; There is symmetry; The straight line between two points is the shortest distance between them.