An equation must be an equation, but an equation is not necessarily an equation.
Example:
1, a+b= 13 conforms to the equation, and there are unknowns. This is an equation and an equation.
2、 1+ 1=2 , 100× 100= 10000。 These two formulas are consistent with the equation, but there are no unknowns, so they are not equations.
In the definition, the equation must be an equation, but there can be other equations, such as 1+ 1 = 2,100×10000 =10000, all of which are equations. Obviously, the range of the equation is larger.
Extended data:
In the equation, identities are called identities, and contradictions are called contradictory equations. When the unknown quantity is equal to a specific value, it is called a conditional equation, which can make the values on both sides of the equal sign equal, for example, the equal sign is established in time. The value of the unknown that makes the left and right sides of the equation equal is called the solution of the equation.
The same solution principle of the equation;
1. The equation obtained by adding or subtracting the same number or the same equation on both sides is the same solution equation as the original equation.
2. The equation obtained by multiplying or dividing the same number whose two sides are not zero is the same as the original equation.
Equations can be divided into contradictory equations and conditional equations. Adding (or subtracting) the same algebraic expression on both sides of the equation, or multiplying or dividing the same algebraic expression that is not zero on both sides of the equation, or multiplying the left and right sides of the equation at the same time, the equation still holds. The form is to connect two equal numbers (or numbers expressed in letters) with "=".
References:
Baidu Encyclopedia-Equation
References:
Baidu Encyclopedia-Equation