1, recursive 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.

2. 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.

3. Calculation method

From left to right, first calculate what is in brackets, then multiply and divide, and finally add and subtract.

Extended data

For example: 596-(7×4+43)

=596-(28+43)

=596-7 1

=525

For example: 1000-(500+499+ 1)

= 1000 - 1000

= 0

reference data

Baidu encyclopedia-recursive equation