32*800-400/25 first subtract, then divide and finally multiply.
32*800-400/25先减再除最后乘．
<gadget id="calculator">800 - 400</gadget>
<output>400</output>

<gadget id="calculator">400 / 25</gadget>
<output>16</output>

<gadget id="calculator">32 * 16</gadget>
<output>512</output>

<result>512</result>