A piece of iron wire is 1 meter long, (2/3) meter is used up for the first time, and the remaining (2/3) is used up for the second time, how many meters are left?
一根铁丝长1米，第一次用去(2/3)米，第二次又用去剩下的(2/3)，还剩下多少米．
<gadget id="calculator">2 / 3</gadget>
<output>2/3 = around 0.666667</output>

<gadget id="calculator">1 - (2/3)</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">(1/3) * (2/3)</gadget>
<output>2/9 = around 0.222222</output>

<gadget id="calculator">1 - (2/3) - (2/9)</gadget>
<output>1/9 = around 0.111111</output>

<result>1/9 = around 0.111111</result>