Equation, which is elementary arithmetic. In the formula of elementary arithmetic, the calculation process is expressed by equations in turn according to the operation order, and such equations are called recursive equations.

Example:

485 - ( 6 × 4 + 32 )

= 485 - ( 24 + 32 )

= 485 - 56

= 429

Operating rules:

Write the equal sign directly by one-step calculation.

If you want to write vertically in the middle of the horizontal direction. (that is, the position of the horizontal form in the second number) If the calculation is carried out in two steps, a recursive equation will be used. Every step should be aligned with the equal sign, the two lines of the equal sign should be parallel, and the length of the equal sign line should be about half a centimeter.

Extended data: operation rules:

1, two-step calculation

To use recursive equations, each step should be aligned and the two lines of the equal sign should be parallel.

When moving to the next column, draw a dotted line in the middle to separate it. If there are brackets, count the numbers in brackets first. The equipotential line is about half a centimeter long. If you want to write vertically in the middle of the horizontal direction.

2, more than two steps of calculation

To use recursive equations, every step should be aligned with the equal sign, and the two lines of the equal sign should be parallel, and the length of the equal sign line should be about half a centimeter.

3. Calculation method

From left to right, the number in brackets comes first.