Cut a piece of wood 1 meter long into 3 sections, the first section is (2/7) meters long, the second section is (3/7) meters long, how many meters is the third section long?
把一根1米长的木料截成3段，第一段长(2/7)米，第二段长(3/7)米，第三段长多少米？
<gadget id="calculator">2 / 7</gadget>
<output>2/7 = around 0.285714</output>

<gadget id="calculator">3 / 7</gadget>
<output>3/7 = around 0.428571</output>

<gadget id="calculator">1 - (2/7) - (3/7)</gadget>
<output>2/7 = around 0.285714</output>

<result>2/7 = around 0.285714</result>