Subtract (2/9) from (5/9) and then subtract (3/9). What is the difference?
从(5/9)里减去(2/9)，再减去(3/9)，差是多少？
<gadget id="calculator">5 / 9</gadget>
<output>5/9 = around 0.555556</output>

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

<gadget id="calculator">3 / 9</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">(5/9) - (2/9) - (1/3)</gadget>
<output>0</output>

<result>0</result>