Xiaoming's electricity bill in March was 56.5 yuan, more than that in February by 8.3 yuan, and the electricity bill in February was 48.2 yuan.

According to the meaning of the question, suppose the electricity bill in February is X yuan.

Column equation:

x+8.3=56.5

Solution: x=48.2

So the electricity bill in February is 48.2 yuan.

The significance of solving equations:

Solving equations avoids the difficulty of reverse thinking, and can 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.