The length of a wire is equal to its own (3/4) plus (3/4) meters, how many meters is 80% of the wire.
一根铁丝的长度等于它本身的(3/4)加(3/4)米，这根铁丝的80%长多少米．
<gadget id="calculator">3 / 4</gadget>
<output>3/4 = around 0.75</output>

<gadget id="calculator">1 - (3/4)</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">(3/4) / (1/4)</gadget>
<output>3</output>

<gadget id="calculator">80 / 100</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">3 * (4/5)</gadget>
<output>12/5 = around 2.4</output>

<result>12/5 = around 2.4</result>