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From Wikipedia: "PEMDAS is an acronym standing for the parentheses, exponent, multiplication, division, addition, and subtraction order of the mathematical order of operations." Note, however, that multiplication and division have the SAME priority; also, addition and subtraction have the SAME priority.
In that case, you need to know the rules about which operations to do first. In normal algebra, powers have a higher priority than multiplications and divisions; and these, in turn, have a higher priority than addition and subtraction.
BIDMAS (UK) or PEMDAS (US). B or P : Brackets (Parentheses) I or E : Index (Exponent) DM or MD : Division and Multiplication. Equal priority, evaluate from left to right. AS : Addition and Subtraction. Equal priority, evaluate from left to right.
disadvantages of priority scheduling
In mathematics, there is an order of priority for arithmetical operations. It is variously known as BODMAS, PODMAS. When working with an expression, an operation indicated by D (Division) must be performed before A (Addition). Sometimes you need to change the order and brackets are used to do that.