10: x=9: (8/5).
10：x=9：(8/5)．
<gadget id="calculator">8 / 5</gadget>
<output>8/5 = around 1.6</output>

<gadget id="calculator">10 * (8/5)</gadget>
<output>16</output>

<gadget id="calculator">16 / 9</gadget>
<output>16/9 = around 1.777778</output>

<result>16/9 = around 1.777778</result>