How much dm is (2/9)dm more than (1/6)dm?
比(1/6)dm多(2/9)dm的是多少dm．
<gadget id="calculator">1 / 6</gadget>
<output>1/6 = around 0.166667</output>

<gadget id="calculator">2 / 9</gadget>
<output>2/9 = around 0.222222</output>

<gadget id="calculator">(1/6) + (2/9)</gadget>
<output>7/18 = around 0.388889</output>

<result>7/18 = around 0.388889</result>