A piece of cloth uses up (4/7) meters, which is less than the remaining (1/7) meters. How many meters is this piece of fabric?
一块布料用去(4/7)米，用去的比剩下的少(1/7)米．这块布料一共多少米？
<gadget id="calculator">4 / 7</gadget>
<output>4/7 = around 0.571429</output>

<gadget id="calculator">1 / 7</gadget>
<output>1/7 = around 0.142857</output>

<gadget id="calculator">(4/7) + (1/7) + (4/7)</gadget>
<output>9/7 = around 1.285714</output>

<result>9/7 = around 1.285714</result>