For a batch of fruits, (1/3) of the total number is transported on the first day, and the rest (1/3) is transported away on the second day, how much of the total number is left.
一批水果，第一天运走总数的(1/3)，第二天运走剩下的(1/3)，还剩总数的多少．
<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">1 * (1/3)</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">1 - (1/3)</gadget>
<output>2/3 = around 0.666667</output>

<gadget id="calculator">1 * (2/3) * (1/3)</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>