Xiaoxin drank a glass of milk (1/2) for the first time, and drank the rest (1/2) for the second time. What fraction of this glass of milk is left?
小新第一次喝了一杯牛奶的(1/2)，第二次喝了剩下的(1/2)，这杯牛奶还剩下几分之几？
<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</output>

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

<gadget id="calculator">(1/2) * (1/2)</gadget>
<output>1/4 = around 0.25</output>

<result>1/4 = around 0.25</result>