24*26-23*27=how much.
24*26-23*27=多少．
<gadget id="calculator">24 * 26</gadget>
<output>624</output>

<gadget id="calculator">23 * 27</gadget>
<output>621</output>

<gadget id="calculator">624 - 621</gadget>
<output>3</output>

<result>3</result>