A mine completed (1/4), (1/6), (3/8), and (1/3) of the annual plan in the four quarters of last year, and what percentage of the annual plan was overfulfilled?
某矿场去年四个季度分别完成全年计划的(1/4)、(1/6)、(3/8)、(1/3)，超额完成全年计划的几分之几？
<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

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

<gadget id="calculator">3 / 8</gadget>
<output>3/8 = around 0.375</output>

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

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

<gadget id="calculator">(1/4) + (1/6) + (3/8) + (-2/3)</gadget>
<output>1/8 = around 0.125</output>

<result>1/8 = around 0.125</result>