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Equation addition calculation problem
The equation addition problem is as follows:

6x+ 18 = 48; 5x-3x = 4; 9+6x = 33; 6x-7 = 1 1; 10-x = 8; 5x+8 = 53; 5+x+2 1 = 56; 90-x = 86; 5x+8 = 53; 9x+4=9 18 .

Data expansion:

An equation refers to an equation containing unknowns. It is an equation that represents the equal relationship between two mathematical expressions (such as two numbers, functions, quantities and operations), and the value of the unknown quantity that makes the equation hold is called "solution" or "root". The process of finding the solution of the equation is called "solving the equation".

By solving the equation, we can avoid the difficulty of reverse thinking and directly list the equations with the quantity to be solved. There are many forms of equations, such as one-dimensional linear equation, two-dimensional linear equation, one-dimensional quadratic equation and so on. , can also be combined into equations to solve multiple unknowns.

In mathematics, an equation is a statement containing one or more variables. Solving an equation involves determining which variables have values that make the equation valid. Variables are also called unknowns, and the value of the unknowns satisfying the equation is called the solution of the equation.

ordinary differential equation

Ordinary differential equations or ODE are equations containing functions of independent variables and their derivatives. Compared with "partial differential equation", the word "constant" involves multiple independent variables.

Linear differential equations with solutions can be added and multiplied by coefficients, clearly defined and understood, and accurate closed solutions can be obtained. In contrast, ODE without additive solutions is nonlinear and very complicated to solve, because they are rarely expressed by basic functions in closed form: on the contrary, the exact solution and analytical solution of ODE are in series or whole form.

The solutions of ordinary differential equations can be approximated by manual or computer-applied graphic and numerical methods, and useful information can be generated, which is usually enough without accurate analytical solutions.