Formula calculation is a recursive equation calculation, which is an operation to write out the calculation process completely, that is, vertical calculation. For example:

1 、( 125+8)x8

= 133x8

= 1064

2、(250÷50)+( 12×4)

=5+48

=53

Algorithm of off-line calculation:

1, multiply first and then divide, then add and subtract.

2. In the calculation of multiplication and division, it should be calculated from left to right. When you encounter parentheses, you must first calculate the inside of parentheses.

3. In the demoulding process, the operation sequence line should be drawn according to the operation sequence, and the "three inspections" should be achieved.

First, check whether the numbers and symbols copied from books to exercise books are correct;

The second is to check whether the numbers and symbols copied from horizontal to vertical are correct;

Third, it is necessary to check whether the draft is copied vertically, horizontally, and whether the decimal point position is correct or not.