Parentheses are usually placed inside brackets.
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No they do not.
parenthesis ( )square brackets [ ]curly brackets { }
Follow PEMDAS (Parenthesis, Exponents, Multiplication, Division, Addition, Subtraction), but do what is in the brackets first.
vise versa of a fraction
in math, they act just like parenthesis, to tell you to operate on the terms inside the brackets, first. If you have several levels of nested parenthesis, then using pairs of brackets [] and braces {} help you to see which ones go together. This usually is only used in handwritten problems, as most computer software only recognizes parenthesis () to separate expressions.