Sometimes if you want to change the operation order, you need to use parentheses at this time.
For example, 5*6-2=30-2=28.
5*(6-2)=5*4=20
Q: But in some algorithms, why pretend to be mysterious and put brackets in the original order?
For example, in the operation of cross product, even without brackets, isn't it from left to right? There are also some associative laws of operations.
A: There are also some associative laws of operation, which should be emphasized.