Find the law: (20/9), (5/3), (11/9), (8/9), how much, (5/9).
找规律：(20/9)、(5/3)、(11/9)、(8/9)、多少、(5/9)．
<gadget id="calculator">8 - 2</gadget>
<output>6</output>

<gadget id="calculator">6 / 9</gadget>
<output>2/3 = around 0.666667</output>

<result>2/3 = around 0.666667</result>