The worker uncle wants to pave a piece of lawn, the first day (2/9) and the second day (3/9), how much of it is left unpaved?
工人叔叔要铺一块草坪，第一天铺了(2/9)，第二天铺了(3/9)，这时还剩几分之几没铺？
<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">1 - (2/9) - (1/3)</gadget>
<output>4/9 = around 0.444444</output>

<result>4/9 = around 0.444444</result>