650-320/80, if you want to change the order of operations and do the subtraction first, then you must use parentheses, what is the formula?
650-320/80，如果要改变运算顺序，先算减法，那么必须使用括号，算式是多少．
<gadget id="calculator">650 - 320</gadget>
<output>330</output>

<gadget id="calculator">330 / 80</gadget>
<output>33/8 = around 4.125</output>

<result>33/8 = around 4.125</result>