(2/4) meters are used up for a piece of iron wire, and (1/4) meter is left, what is the original length of this iron wire?
一根铁丝用去(2/4)米，还剩下(1/4)米，这根铁丝原来长多少米．
<gadget id="calculator">2 / 4</gadget>
<output>1/2 = around 0.5</output>

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

<gadget id="calculator">(1/2) + (1/4)</gadget>
<output>3/4 = around 0.75</output>

<result>3/4 = around 0.75</result>