A piece of cake is cut into 9 pieces on average, mother ate 3 pieces, Xiaoming ate 2 pieces, and there is still ((())/(())) of this piece of cake.
一块饼平均切成9块，妈妈吃了3块，小明吃了2块，还剩下这块饼的((())/(()))．
<gadget id="calculator">3 / 9</gadget>
<output>1/3 = around 0.333333</output>

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

<gadget id="calculator">1 - (1/3) - (2/9)</gadget>
<output>4/9 = around 0.444444</output>

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