Which of the following numbers is less than (1/2) (1/9).
下面各数中，多少比(1/2)少(1/9)．
<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">1 / 9</gadget>
<output>1/9 = around 0.111111</output>

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

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