Construct expressions that equal $31$, $32$, $33$, and $34$ using the numbers $1$, $2$, $6$, and $7$. In each expression, each number must be used exactly once. You addition ($+$), subtraction ($-$), multiplication ($\times$), and division ($\div$). You may also use parentheses.
I have found several ways to do this for 33 but not for the other answers.