The number of A is 10, the number of B is 8, (10-8)/8 means how much more A is than B
甲数是10，乙数是8，(10-8)/8表示甲比乙多多少
<gadget id="calculator">10 - 8</gadget>
<output>2</output>

<gadget id="calculator">2 / 8</gadget>
<output>1/4 = around 0.25</output>

<result>1/4 = around 0.25</result>