2 (1/9) plus 5 (1/9) results in ((())/(())).
2个(1/9)加上5个(1/9)结果是((())/(()))．
<gadget id="calculator">9 / 1</gadget>
<output>9</output>

<gadget id="calculator">7 / 9</gadget>
<output>7/9 = around 0.777778</output>

<result>7/9 = around 0.777778</result>