A steel pipe is (5/7) meters long. Dad saw the steel pipe 3 times. Each section cut off is the same length. The length of each section is the original steel pipe (fill in the simplest fraction)
一根钢管长(5/7)米，爸爸把这根钢管锯了3次，锯下的每段同样长，每段长是原来这根钢管的多少(填最简分数)
<gadget id="calculator">3 + 1</gadget>
<output>4</output>

<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

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