Sample compilation
( 125+8)x8
= 133x8
= 1064
(250÷50)+( 12×4)
=5+48
=53
How to calculate the distortion? The main thing to master is to remember to calculate multiplication and division first, and then add and subtract. In the successive 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. In the process of separation, the operation sequence line should be drawn according to the operation sequence, and the "three checks" should be done well. First of all, check whether the numbers and symbols copied from books to exercise books are correct. Second, check whether the numbers and symbols copied from horizontal to vertical are copied correctly. Third, it is necessary to check whether the draft is copied vertically, horizontally, and whether the decimal point position is correct or not.
(1) sibling operations In an expression, if only sibling operations are included, the operations should be performed from left to right. That is to say, only addition and subtraction, or only multiplication and division are mixed operations, and their operation order is calculated from left to right.
(2) One-to-two operation
In an expression, if both first-level operation and second-level operation are included, then the second-level operation should be calculated first, and then the first-level operation should be calculated. That is, "multiply first and then divide, then add and subtract", or "multiply first and then divide, then add and subtract" for short.
(3) Operation with brackets
If you want to change the order of the operations mentioned above, you need to use parentheses. There are three kinds of brackets commonly used: parentheses, marked as (); Parentheses, marked as [; Braces, marked {}. When using the bracket, pull on both sides and add in the middle. Use parentheses first, then brackets, and finally braces.
(4) Simple algorithm for changing symbols If there is a minus sign outside the brackets and a plus sign or minus sign inside the brackets, change the symbols inside the brackets. There is a plus sign outside the brackets, and it doesn't matter whether there is a plus sign or a minus sign inside the brackets.