A piece of rope, (4/5) meter is used for the first time, and the remaining (1/2) meter is less than the used one. How many meters is the total length of this piece of rope?
一段绳子，第一次用去(4/5)米，这时余下的比用去的还少(1/2)米，这段绳子全长多少米？
<gadget id="calculator">4 / 5</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">(4/5) - (1/2)</gadget>
<output>3/10 = around 0.3</output>

<gadget id="calculator">(3/10) + (4/5)</gadget>
<output>11/10 = around 1.1</output>

<result>11/10 = around 1.1</result>