A piece of cake is cut into 6 pieces on average, Dad ate 2 pieces, Xiao Ming ate 1 piece, and there is still ((())/(())) of this piece of cake.
一块饼平均切成6块，爸爸吃了2块，小明吃了1块，还剩下这块饼的((())/(()))．
<gadget id="calculator">2 / 6</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">1 / 6</gadget>
<output>1/6 = around 0.166667</output>

<gadget id="calculator">1 - (1/3) - (1/6)</gadget>
<output>1/2 = around 0.5</output>

<result>1/2 = around 0.5</result>