# How to solve matrix 3x3

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Math can be difficult to understand, but it's important to learn How to solve matrix 3x3. Obviously, the area change area is in the rectangular area outside the cyan red (triangle) and inside the (large triangle). To show the clarity of change. We used yellow L-shape and green L-shape to express them respectively. The accuracy of area calculation should be determined by the accuracy of measurement.

In tunnel engineering, the surrounding rock condition is usually represented by the surrounding rock classification. At present, many widely used surrounding rock classification methods have been proposed, but the classification methods in different industry standards are still quite different, and the commonly used surrounding rock classification index system is a simple calculation and algebraic superposition of surrounding rock lithology, integrity, geological structure conditions and other indicators, without fully considering the weight of each impact factor. In addition, the advanced geological prediction combined with different geophysical prospecting technologies has become one of the common means of dynamic classification of surrounding rock in tunnels at present. However, the interpretation of detection data in the advanced geological prediction is still mainly carried out manually, which has certain subjectivity and experience.

In the process of solving the method of moments, the generalized moment needs to be calculated, so it is named. The method of moments includes the following three basic processes: (1) discretization process: the main purpose is to transform operator equations into algebraic equations; (2) Sampling detection process: the main purpose is to convert the problem of solving algebraic equations into the problem of solving matrix equations; (3) Matrix inversion process: the work it does is to transform the integral equation into a difference equation, or to integrate the integral equation into a finite sum, so as to establish an algebraic equation group. Like the finite element method, the method of moments also uses the weighted residual method, which discretizes the linear operator into a matrix equation. The difference is that the finite element method solves the differential form of Maxwell's equations, while the moment method solves the integral form of Maxwell's equations. The scheme is unconditionally stable.

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