Xiao Ming bought a piece of cake for his birthday, his mother ate the cake (2/9), his father and mother ate the same amount, and Xiao Ming ate the rest, what fraction of the day did Xiao Ming eat this cake?
小明过生日，买了一块蛋糕，妈妈吃了这个蛋糕的(2/9)，爸爸和妈妈吃同样多，剩下的小明吃，小明吃了这块蛋糕天的几分之几？
<gadget id="calculator">2 / 9</gadget>
<output>2/9 = around 0.222222</output>

<gadget id="calculator">1 - (2/9) - (2/9)</gadget>
<output>5/9 = around 0.555556</output>

<result>5/9 = around 0.555556</result>