A glass of milk, I drank (1/3) for the first time, and drank the rest (1/3) for the second time, what fraction of this glass of milk is left?
一杯牛奶，第一次喝了(1/3)，第二次喝了剩下的(1/3)，还剩下这杯牛奶的几分之几？
<gadget id="calculator">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">(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>