[summary: When an expression from rational arithmetic is written out, evaluate anything in brackets first; then perform multiplication and division left-to-right; then perform addition and subtraction left-to-right.]

[todo: write the page]

Our shorthand for all the operations on rationals is very useful, but full of brackets; this is how to get rid of some of the brackets.

[summary: When an expression from rational arithmetic is written out, evaluate anything in brackets first; then perform multiplication and division left-to-right; then perform addition and subtraction left-to-right.]

[todo: write the page]