Lecture
This lecture explains the importance of moving parentheses before calculations using the properties of operations, such as commutativity and associativity. It introduces the rule of simplification for expressions involving only additions or multiplications, where unnecessary parentheses can be omitted. The lecture also covers rules combining the four operations based on the properties of subtraction and division, emphasizing the distinction between positive and negative integers. Additionally, it discusses the priority rules for operations, highlighting the precedence of powers and roots over other operations, as well as the sequence for performing operations of the same priority level.