A glass of milk, the first time I drank the whole cup (1/6), the second time I drank the whole cup (2/3), what fraction of the rest accounted for this glass of milk?
一杯牛奶，第一次喝了全杯的(1/6)，第二次喝了全杯的(2/3)，剩下的占这杯牛奶的几分之几？
<gadget id="calculator">1 / 6</gadget>
<output>1/6 = around 0.166667</output>

<gadget id="calculator">2 / 3</gadget>
<output>2/3 = around 0.666667</output>

<gadget id="calculator">1 - (1/6) - (2/3)</gadget>
<output>1/6 = around 0.166667</output>

<result>1/6 = around 0.166667</result>